C I V I L I Z A T I O N    A D V A N C E S
                           Cross Reference


    <- = prerequisites, listed in reverse chronological order
    -> = successors, listed in forward chronological order


    ADVANCES
    --------

    Alphabet          -> Writing, MapMaking, Code of Laws, Mathematics,
                         Diplomat, Library, Trireme, Lighthouse, Courthouse,
                         Literacy, Monarchy, Trade, Catapult, Astronomy,
                         Great Library, Republic, Philosophy, Feudalism,
                         Caravan, Copernicus, Navigation, Banking, Medicine,
                         Religion, Democracy, University, Chivalry,
                         Invention, Sail, Magellan, Physics, Bank,
                         Shakespeare, Cathedral, J.S. Bach, Michelangelo,
                         Chemistry, University (Imp), Theory of Gravity,
                         Knight, Gunpowder, Magnetism, Steam Engine,
                         Isaac Newton, Atomic Theory, Explosives, Musketeer,
                         Metallurgy, Frigate, Railroad, Ironclad,
                         Conscription, Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Bronze Working    -> Iron Working, Currency, Legion, Marketplace, Trade,
                         Construction, Caravan, Aqueduct, Colosseum,
                         Fortress, Engineering, Bridge Building, Banking,
                         Medicine, Invention, Bank, Shakespeare, Chemistry,
                         Gunpowder, Steam Engine, Explosives, Musketeer,
                         Metallurgy, Railroad, Ironclad, Conscription,
                         Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Ceremonial Burial -> Temple, Mysticism, Monarchy, Oracle, Astronomy,
                         Philosophy, Feudalism, Copernicus, Navigation,
                         Medicine, Religion, Democracy, University, Chivalry,
                         Sail, Magellan, Physics, Shakespeare, Cathedral,
                         J.S. Bach, Michelangelo, Chemistry,
                         University (Imp), Theory of Gravity, Knight,
                         Magnetism, Steam Engine, Isaac Newton,
                         Atomic Theory, Explosives, Metallurgy, Frigate,
                         Railroad, Ironclad, Conscription, Cannon,
                         Electricity, Darwin's Voyage, Industrialization,
                         Rifleman, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Masonry           -> Palace, City Wall, Pyramids, Great Wall,
                         Mathematics, Construction, Catapult, Astronomy,
                         Feudalism, Aqueduct, Colosseum, Fortress,
                         Engineering, Bridge Building, Copernicus,
                         Navigation, University, Chivalry, Invention, Sail,
                         Magellan, Physics, Chemistry, University (Imp),
                         Theory of Gravity, Knight, Gunpowder, Magnetism,
                         Steam Engine, Isaac Newton, Atomic Theory,
                         Explosives, Musketeer, Metallurgy, Frigate,
                         Railroad, Ironclad, Conscription, Cannon,
                         Electricity, Darwin's Voyage, Industrialization,
                         Rifleman, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    The Wheel         -> Chariot, Engineering, Invention, Gunpowder,
                         Steam Engine, Explosives, Musketeer, Metallurgy,
                         Railroad, Ironclad, Conscription, Cannon,
                         Electricity, Darwin's Voyage, Industrialization,
                         Rifleman, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Horseback Riding  -> Cavalry, Chivalry, Knight

    Pottery           -> Granary, Hanging Garden

    Map Making        -> Navigation, Sail, Magellan, Physics, Magnetism,
                         Steam Engine, Atomic Theory, Frigate, Railroad,
                         Ironclad, Electricity, Darwin's Voyage,
                         Industrialization, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Writing           <- Alphabet

                      -> Diplomat, Library, Literacy, Great Library,
                         Republic, Philosophy, Banking, Medicine, Religion,
                         Democracy, University, Invention, Bank, Shakespeare,
                         Cathedral, J.S. Bach, Michelangelo, Chemistry,
                         University (Imp), Theory of Gravity, Gunpowder,
                         Steam Engine, Isaac Newton, Atomic Theory,
                         Explosives, Musketeer, Metallurgy, Railroad,
                         Ironclad, Conscription, Cannon, Electricity,
                         Darwin's Voyage, Industrialization, Rifleman,
                         Electronics, Transport, Factory, Women's Suffrage,
                         Steel, Corporation, Communism, Hydro Plant,
                         Hoover Dam, Computers, Battleship, Refining,
                         Genetic Eng., United Nations, SETI Program,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    MapMaking         <- Alphabet

                      -> Trireme, Lighthouse

    Code of Laws      <- Alphabet

                      -> Courthouse, Literacy, Monarchy, Trade,
                         Great Library, Republic, Philosophy, Feudalism,
                         Caravan, Banking, Medicine, Religion, Democracy,
                         University, Chivalry, Invention, Bank, Shakespeare,
                         Cathedral, J.S. Bach, Michelangelo, Chemistry,
                         University (Imp), Theory of Gravity, Knight,
                         Gunpowder, Steam Engine, Isaac Newton,
                         Atomic Theory, Explosives, Musketeer, Metallurgy,
                         Railroad, Ironclad, Conscription, Cannon,
                         Electricity, Darwin's Voyage, Industrialization,
                         Rifleman, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Iron Working      <- Bronze Working

                      -> Legion, Bridge Building, Gunpowder, Explosives,
                         Musketeer, Metallurgy, Railroad, Conscription,
                         Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Currency          <- Bronze Working

                      -> Marketplace, Trade, Construction, Caravan, Aqueduct,
                         Colosseum, Fortress, Engineering, Bridge Building,
                         Banking, Medicine, Invention, Bank, Shakespeare,
                         Chemistry, Gunpowder, Steam Engine, Explosives,
                         Musketeer, Metallurgy, Railroad, Ironclad,
                         Conscription, Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Mysticism         <- Ceremonial Burial

                      -> Oracle, Astronomy, Philosophy, Copernicus,
                         Navigation, Medicine, Religion, Democracy,
                         University, Sail, Magellan, Physics, Shakespeare,
                         Cathedral, J.S. Bach, Michelangelo, Chemistry,
                         University (Imp), Theory of Gravity, Magnetism,
                         Steam Engine, Isaac Newton, Atomic Theory,
                         Explosives, Metallurgy, Frigate, Railroad, Ironclad,
                         Conscription, Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Mathematics       <- Masonry, Alphabet

                      -> Catapult, Astronomy, Copernicus, Navigation,
                         University, Sail, Magellan, Physics, Chemistry,
                         University (Imp), Theory of Gravity, Magnetism,
                         Steam Engine, Isaac Newton, Atomic Theory,
                         Explosives, Metallurgy, Frigate, Railroad, Ironclad,
                         Conscription, Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Literacy          <- Code of Laws, Writing, Alphabet

                      -> Great Library, Republic, Philosophy, Banking,
                         Medicine, Religion, Democracy, University,
                         Invention, Bank, Shakespeare, Cathedral, J.S. Bach,
                         Michelangelo, Chemistry, University (Imp),
                         Theory of Gravity, Gunpowder, Steam Engine,
                         Isaac Newton, Atomic Theory, Explosives, Musketeer,
                         Metallurgy, Railroad, Ironclad, Conscription,
                         Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Monarchy          <- Code of Laws, Ceremonial Burial, Alphabet

                      -> Feudalism, Chivalry, Knight

    Trade             <- Currency, Code of Laws, Bronze Working, Alphabet

                      -> Caravan, Banking, Medicine, Bank, Shakespeare,
                         Chemistry, Explosives, Conscription,
                         Industrialization, Rifleman, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Battleship, Refining, Genetic Eng., United Nations,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Construction      <- Currency, Masonry, Bronze Working

                      -> Aqueduct, Colosseum, Fortress, Engineering,
                         Bridge Building, Invention, Gunpowder, Steam Engine,
                         Explosives, Musketeer, Metallurgy, Railroad,
                         Ironclad, Conscription, Cannon, Electricity,
                         Darwin's Voyage, Industrialization, Rifleman,
                         Electronics, Transport, Factory, Women's Suffrage,
                         Steel, Corporation, Communism, Hydro Plant,
                         Hoover Dam, Computers, Battleship, Refining,
                         Genetic Eng., United Nations, SETI Program,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Astronomy         <- Mathematics, Mysticism, Masonry, Ceremonial Burial,
                         Alphabet

                      -> Copernicus, Navigation, Sail, Magellan, Physics,
                         Theory of Gravity, Magnetism, Steam Engine,
                         Isaac Newton, Atomic Theory, Frigate, Railroad,
                         Ironclad, Electricity, Darwin's Voyage,
                         Industrialization, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Republic          <- Literacy, Code of Laws, Writing, Alphabet

                      -> Banking, Bank, Conscription, Industrialization,
                         Rifleman, Transport, Factory, Women's Suffrage,
                         Steel, Corporation, Communism, Battleship, Refining,
                         Genetic Eng., United Nations, Power Plant,
                         Combustion, Cure for Cancer, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Philosophy        <- Literacy, Mysticism, Code of Laws, Writing,
                         Ceremonial Burial, Alphabet

                      -> Medicine, Religion, Democracy, University,
                         Shakespeare, Cathedral, J.S. Bach, Michelangelo,
                         Chemistry, University (Imp), Theory of Gravity,
                         Isaac Newton, Atomic Theory, Explosives, Metallurgy,
                         Conscription, Cannon, Electricity, Rifleman,
                         Electronics, Steel, Communism, Hydro Plant,
                         Hoover Dam, Computers, Battleship, Refining,
                         Genetic Eng., United Nations, SETI Program,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Feudalism         <- Monarchy, Code of Laws, Masonry, Ceremonial Burial,
                         Alphabet

                      -> Chivalry, Knight

    Engineering       <- Construction, Currency, The Wheel, Masonry,
                         Bronze Working

                      -> Invention, Gunpowder, Steam Engine, Explosives,
                         Musketeer, Metallurgy, Railroad, Ironclad,
                         Conscription, Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Bridge Building   <- Construction, Currency, Iron Working, Masonry,
                         Bronze Working

                      -> Railroad, Darwin's Voyage, Industrialization,
                         Transport, Factory, Women's Suffrage, Steel,
                         Corporation, Communism, Battleship, Refining,
                         Genetic Eng., United Nations, Power Plant,
                         Combustion, Cure for Cancer, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Navigation        <- Astronomy, Mathematics, Mysticism, Map Making,
                         Masonry, Ceremonial Burial, Alphabet

                      -> Sail, Magellan, Physics, Magnetism, Steam Engine,
                         Atomic Theory, Frigate, Railroad, Ironclad,
                         Electricity, Darwin's Voyage, Industrialization,
                         Electronics, Transport, Factory, Women's Suffrage,
                         Steel, Corporation, Communism, Hydro Plant,
                         Hoover Dam, Computers, Battleship, Refining,
                         Genetic Eng., United Nations, SETI Program,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Banking           <- Republic, Trade, Literacy, Currency, Code of Laws,
                         Writing, Bronze Working, Alphabet

                      -> Bank, Industrialization, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Battleship, Refining, Genetic Eng., United Nations,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Medicine          <- Philosophy, Trade, Literacy, Mysticism, Currency,
                         Code of Laws, Writing, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Shakespeare, Chemistry, Explosives, Conscription,
                         Rifleman, Refining, Genetic Eng., Power Plant,
                         Combustion, Cure for Cancer, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Religion          <- Philosophy, Literacy, Mysticism, Code of Laws,
                         Writing, Ceremonial Burial, Alphabet

                      -> Cathedral, J.S. Bach, Michelangelo

    Democracy         <- Philosophy, Literacy, Mysticism, Code of Laws,
                         Writing, Ceremonial Burial, Alphabet

                      -> Recycling, Recycling Center

    University        <- Philosophy, Literacy, Mathematics, Mysticism,
                         Code of Laws, Writing, Masonry, Ceremonial Burial,
                         Alphabet

                      -> Chemistry, University (Imp), Theory of Gravity,
                         Isaac Newton, Atomic Theory, Explosives, Metallurgy,
                         Conscription, Cannon, Electricity, Rifleman,
                         Electronics, Steel, Hydro Plant, Hoover Dam,
                         Computers, Battleship, Refining, SETI Program,
                         Power Plant, Combustion, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Chivalry          <- Feudalism, Monarchy, Code of Laws, Horseback Riding,
                         Masonry, Ceremonial Burial, Alphabet

                      -> Knight

    Invention         <- Engineering, Construction, Literacy, Currency,
                         Code of Laws, Writing, The Wheel, Masonry,
                         Bronze Working, Alphabet

                      -> Gunpowder, Steam Engine, Explosives, Musketeer,
                         Metallurgy, Railroad, Ironclad, Conscription,
                         Cannon, Electricity, Darwin's Voyage,
                         Industrialization, Rifleman, Electronics, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Hydro Plant, Hoover Dam, Computers,
                         Battleship, Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Physics           <- Navigation, Astronomy, Mathematics, Mysticism,
                         Map Making, Masonry, Ceremonial Burial, Alphabet

                      -> Magnetism, Steam Engine, Atomic Theory, Frigate,
                         Railroad, Ironclad, Electricity, Darwin's Voyage,
                         Industrialization, Electronics, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         Refining, Genetic Eng., United Nations,
                         SETI Program, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Chemistry         <- University, Medicine, Philosophy, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Code of Laws,
                         Writing, Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Explosives, Conscription, Rifleman, Refining,
                         Power Plant, Combustion, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Theory of Gravity <- University, Philosophy, Astronomy, Literacy,
                         Mathematics, Mysticism, Code of Laws, Writing,
                         Masonry, Ceremonial Burial, Alphabet

                      -> Isaac Newton, Atomic Theory, Nuclear Fission,
                         Manhattan Project, Nuclear Power, Nuclear Plant,
                         Fusion Power

    Gunpowder         <- Invention, Engineering, Construction, Literacy,
                         Currency, Iron Working, Code of Laws, Writing,
                         The Wheel, Masonry, Bronze Working, Alphabet

                      -> Explosives, Musketeer, Metallurgy, Conscription,
                         Cannon, Electricity, Rifleman, Electronics, Steel,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         SETI Program, Combustion, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Magnetism         <- Physics, Navigation, Astronomy, Mathematics,
                         Mysticism, Map Making, Masonry, Ceremonial Burial,
                         Alphabet

                      -> Frigate, Electricity, Electronics, Hydro Plant,
                         Hoover Dam, Computers, SETI Program,
                         Advanced Flight, Bomber, Carrier, Rocketry,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Steam Engine      <- Physics, Invention, Navigation, Engineering,
                         Astronomy, Construction, Literacy, Mathematics,
                         Mysticism, Currency, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Railroad, Ironclad, Darwin's Voyage,
                         Industrialization, Transport, Factory,
                         Women's Suffrage, Steel, Corporation, Communism,
                         Battleship, Refining, Genetic Eng., United Nations,
                         Power Plant, Combustion, Cure for Cancer,
                         Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Atomic Theory     <- Theory of Gravity, Physics, University, Navigation,
                         Philosophy, Astronomy, Literacy, Mathematics,
                         Mysticism, Code of Laws, Writing, Map Making,
                         Masonry, Ceremonial Burial, Alphabet

                      -> Nuclear Fission, Manhattan Project, Nuclear Power,
                         Nuclear Plant, Fusion Power

    Explosives        <- Gunpowder, Chemistry, Invention, University,
                         Medicine, Engineering, Philosophy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Conscription, Rifleman, Combustion, Automobile,
                         Cruiser, Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Metallurgy        <- Gunpowder, Invention, University, Engineering,
                         Philosophy, Construction, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Cannon, Electricity, Electronics, Steel,
                         Hydro Plant, Hoover Dam, Computers, Battleship,
                         SETI Program, Automobile, Armor, Mass Production,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Railroad          <- Steam Engine, Physics, Invention, Navigation,
                         Bridge Building, Engineering, Astronomy,
                         Construction, Literacy, Mathematics, Mysticism,
                         Currency, Iron Working, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Darwin's Voyage, Industrialization, Transport,
                         Factory, Women's Suffrage, Steel, Corporation,
                         Communism, Battleship, Refining, Genetic Eng.,
                         United Nations, Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Conscription      <- Explosives, Gunpowder, Chemistry, Invention,
                         University, Medicine, Engineering, Philosophy,
                         Republic, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

                      -> Rifleman

    Electricity       <- Metallurgy, Magnetism, Gunpowder, Physics,
                         Invention, University, Navigation, Engineering,
                         Philosophy, Astronomy, Construction, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Electronics, Hydro Plant, Hoover Dam, Computers,
                         SETI Program, Advanced Flight, Bomber, Carrier,
                         Rocketry, Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Industrialization <- Railroad, Steam Engine, Physics, Invention, Banking,
                         Navigation, Bridge Building, Engineering, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working, </pre><pre id="faqspan-2">
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Transport, Factory, Women's Suffrage, Steel,
                         Corporation, Communism, Battleship, Refining,
                         Genetic Eng., United Nations, Power Plant,
                         Combustion, Cure for Cancer, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Electronics       <- Electricity, Metallurgy, Magnetism, Gunpowder,
                         Physics, Invention, University, Navigation,
                         Engineering, Philosophy, Astronomy, Construction,
                         Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Hydro Plant, Hoover Dam, Computers, SETI Program,
                         Rocketry, Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Steel             <- Industrialization, Railroad, Metallurgy,
                         Steam Engine, Gunpowder, Physics, Invention,
                         University, Banking, Navigation, Bridge Building,
                         Engineering, Philosophy, Republic, Astronomy,
                         Construction, Trade, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

                      -> Battleship, Automobile, Armor, Mass Production,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Plant,
                         Superconductor, Fusion Power, SDI Defence

    Corporation       <- Industrialization, Railroad, Steam Engine, Physics,
                         Invention, Banking, Navigation, Bridge Building,
                         Engineering, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Refining, Genetic Eng., Power Plant, Combustion,
                         Cure for Cancer, Automobile, Cruiser, Flight, Armor,
                         Mass Production, Fighter, Advanced Flight,
                         Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Bomber, Carrier, Rocketry,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Unit, Space Flight,
                         Nuclear Plant, SS Structure, Apollo Program,
                         Plastic, SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Communism         <- Industrialization, Railroad, Steam Engine, Physics,
                         Invention, Banking, Navigation, Bridge Building,
                         Engineering, Philosophy, Republic, Astronomy,
                         Construction, Trade, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

                      -> United Nations, Labor Union, Mech Infantry

    Computers         <- Electronics, Electricity, Metallurgy, Magnetism,
                         Gunpowder, Physics, Invention, University,
                         Navigation, Engineering, Philosophy, Astronomy,
                         Construction, Literacy, Mathematics, Mysticism,
                         Currency, Iron Working, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> SETI Program, Space Flight, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Refining          <- Corporation, Industrialization, Railroad,
                         Steam Engine, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Power Plant, Combustion, Automobile, Cruiser,
                         Flight, Armor, Mass Production, Fighter,
                         Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Genetic Eng.      <- Corporation, Industrialization, Railroad,
                         Steam Engine, Physics, Invention, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Cure for Cancer

    Combustion        <- Refining, Corporation, Industrialization, Railroad,
                         Explosives, Steam Engine, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Automobile, Cruiser, Flight, Armor, Mass Production,
                         Fighter, Advanced Flight, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission, Bomber,
                         Carrier, Rocketry, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Unit,
                         Space Flight, Nuclear Plant, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Automobile        <- Combustion, Refining, Corporation, Steel,
                         Industrialization, Railroad, Metallurgy, Explosives,
                         Steam Engine, Gunpowder, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Armor, Mass Production, Labor Union, Submarine,
                         Mass Transit, Recycling, Nuclear Fission,
                         Mech Infantry, Recycling Center, Manhattan Project,
                         Nuclear Power, Nuclear Plant, Superconductor,
                         Fusion Power, SDI Defence

    Flight            <- Combustion, Refining, Corporation,
                         Industrialization, Railroad, Explosives,
                         Steam Engine, Gunpowder, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Fighter, Advanced Flight, Bomber, Carrier, Rocketry,
                         Nuclear Unit, Space Flight, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Mass Production   <- Automobile, Combustion, Refining, Corporation,
                         Steel, Industrialization, Railroad, Metallurgy,
                         Explosives, Steam Engine, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Labor Union, Submarine, Mass Transit, Recycling,
                         Nuclear Fission, Mech Infantry, Recycling Center,
                         Manhattan Project, Nuclear Power, Nuclear Plant,
                         Superconductor, Fusion Power, SDI Defence

    Advanced Flight   <- Flight, Combustion, Refining, Corporation,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Bomber, Carrier, Rocketry, Nuclear Unit,
                         Space Flight, SS Structure, Apollo Program, Plastic,
                         SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Labor Union       <- Mass Production, Automobile, Combustion, Refining,
                         Communism, Corporation, Steel, Industrialization,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Mech Infantry

    Recycling         <- Mass Production, Automobile, Combustion, Refining,
                         Corporation, Steel, Industrialization, Railroad,
                         Metallurgy, Explosives, Steam Engine, Gunpowder,
                         Chemistry, Physics, Invention, University,
                         Democracy, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Recycling Center

    Nuclear Fission   <- Mass Production, Automobile, Combustion, Refining,
                         Corporation, Steel, Industrialization, Railroad,
                         Metallurgy, Explosives, Atomic Theory, Steam Engine,
                         Gunpowder, Theory of Gravity, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Manhattan Project, Nuclear Power, Nuclear Plant,
                         Fusion Power

    Rocketry          <- Advanced Flight, Flight, Combustion, Refining,
                         Corporation, Electronics, Industrialization,
                         Electricity, Railroad, Metallurgy, Explosives,
                         Steam Engine, Magnetism, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Nuclear Unit, Space Flight, SS Structure,
                         Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Nuclear Power     <- Nuclear Fission, Mass Production, Automobile,
                         Combustion, Refining, Corporation, Steel,
                         Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Atomic Theory,
                         Steam Engine, Magnetism, Gunpowder,
                         Theory of Gravity, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Nuclear Plant, Fusion Power

    Space Flight      <- Rocketry, Advanced Flight, Flight, Combustion,
                         Refining, Computers, Corporation, Electronics,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> SS Structure, Apollo Program, Plastic, SS Component,
                         Superconductor, Robotics, Fusion Power, SDI Defence,
                         Artillery, Mfg Plant, SS Module

    Plastic           <- Space Flight, Rocketry, Advanced Flight, Flight,
                         Combustion, Refining, Computers, Corporation,
                         Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> SS Component, Superconductor, Robotics,
                         Fusion Power, SDI Defence, Artillery, Mfg Plant,
                         SS Module

    Superconductor    <- Plastic, Space Flight, Rocketry, Advanced Flight,
                         Mass Production, Flight, Automobile, Combustion,
                         Refining, Computers, Corporation, Steel,
                         Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

                      -> Fusion Power, SDI Defence

    Robotics          <- Plastic, Space Flight, Rocketry, Advanced Flight,
                         Flight, Combustion, Refining, Computers,
                         Corporation, Electronics, Industrialization,
                         Electricity, Railroad, Metallurgy, Explosives,
                         Steam Engine, Magnetism, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

                      -> Artillery, Mfg Plant, SS Module

    Fusion Power      <- Superconductor, Plastic, Space Flight,
                         Nuclear Power, Rocketry, Nuclear Fission,
                         Advanced Flight, Mass Production, Flight,
                         Automobile, Combustion, Refining, Computers,
                         Corporation, Steel, Electronics, Industrialization,
                         Electricity, Railroad, Metallurgy, Explosives,
                         Atomic Theory, Steam Engine, Magnetism, Gunpowder,
                         Theory of Gravity, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet



    IMPROVEMENTS
    ------------

    Temple            <- Ceremonial Burial

    Palace            <- Masonry

    City Wall         <- Masonry

    Granary           <- Pottery

    Library           <- Writing, Alphabet

    Courthouse        <- Code of Laws, Alphabet

    Marketplace       <- Currency, Bronze Working

    Aqueduct          <- Construction, Currency, Masonry, Bronze Working

    Colosseum         <- Construction, Currency, Masonry, Bronze Working

    Fortress          <- Construction, Currency, Masonry, Bronze Working

    Bank              <- Banking, Republic, Trade, Literacy, Currency,
                         Code of Laws, Writing, Bronze Working, Alphabet

    Cathedral         <- Religion, Philosophy, Literacy, Mysticism,
                         Code of Laws, Writing, Ceremonial Burial, Alphabet

    University (Imp)  <- University, Philosophy, Literacy, Mathematics,
                         Mysticism, Code of Laws, Writing, Masonry,
                         Ceremonial Burial, Alphabet

    Factory           <- Industrialization, Railroad, Steam Engine, Physics,
                         Invention, Banking, Navigation, Bridge Building,
                         Engineering, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Hydro Plant       <- Electronics, Electricity, Metallurgy, Magnetism,
                         Gunpowder, Physics, Invention, University,
                         Navigation, Engineering, Philosophy, Astronomy,
                         Construction, Literacy, Mathematics, Mysticism,
                         Currency, Iron Working, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Power Plant       <- Refining, Corporation, Industrialization, Railroad,
                         Steam Engine, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    Mass Transit      <- Mass Production, Automobile, Combustion, Refining,
                         Corporation, Steel, Industrialization, Railroad,
                         Metallurgy, Explosives, Steam Engine, Gunpowder,
                         Chemistry, Physics, Invention, University, Medicine,
                         Banking, Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Recycling Center  <- Recycling, Mass Production, Automobile, Combustion,
                         Refining, Corporation, Steel, Industrialization,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Democracy, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Nuclear Plant     <- Nuclear Power, Nuclear Fission, Mass Production,
                         Automobile, Combustion, Refining, Corporation,
                         Steel, Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Atomic Theory,
                         Steam Engine, Magnetism, Gunpowder,
                         Theory of Gravity, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    SS Structure      <- Space Flight, Rocketry, Advanced Flight, Flight,
                         Combustion, Refining, Computers, Corporation,
                         Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    SS Component      <- Plastic, Space Flight, Rocketry, Advanced Flight,
                         Flight, Combustion, Refining, Computers,
                         Corporation, Electronics, Industrialization,
                         Electricity, Railroad, Metallurgy, Explosives,
                         Steam Engine, Magnetism, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    SDI Defence       <- Superconductor, Plastic, Space Flight, Rocketry,
                         Advanced Flight, Mass Production, Flight,
                         Automobile, Combustion, Refining, Computers,
                         Corporation, Steel, Electronics, Industrialization,
                         Electricity, Railroad, Metallurgy, Explosives,
                         Steam Engine, Magnetism, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Mfg Plant         <- Robotics, Plastic, Space Flight, Rocketry,
                         Advanced Flight, Flight, Combustion, Refining,
                         Computers, Corporation, Electronics,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    SS Module         <- Robotics, Plastic, Space Flight, Rocketry,
                         Advanced Flight, Flight, Combustion, Refining,
                         Computers, Corporation, Electronics,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet



    WONDERS OF THE WORLD
    --------------------

    Pyramids          <- Masonry

    Great Wall        <- Masonry

    Hanging Garden    <- Pottery

    Lighthouse        <- MapMaking, Alphabet

    Oracle            <- Mysticism, Ceremonial Burial

    Great Library     <- Literacy, Code of Laws, Writing, Alphabet

    Copernicus        <- Astronomy, Mathematics, Mysticism, Masonry,
                         Ceremonial Burial, Alphabet

    Magellan          <- Navigation, Astronomy, Mathematics, Mysticism,
                         Map Making, Masonry, Ceremonial Burial, Alphabet

    Shakespeare       <- Medicine, Philosophy, Trade, Literacy, Mysticism,
                         Currency, Code of Laws, Writing, Ceremonial Burial,
                         Bronze Working, Alphabet

    J.S. Bach         <- Religion, Philosophy, Literacy, Mysticism,
                         Code of Laws, Writing, Ceremonial Burial, Alphabet

    Michelangelo      <- Religion, Philosophy, Literacy, Mysticism,
                         Code of Laws, Writing, Ceremonial Burial, Alphabet

    Isaac Newton      <- Theory of Gravity, University, Philosophy,
                         Astronomy, Literacy, Mathematics, Mysticism,
                         Code of Laws, Writing, Masonry, Ceremonial Burial,
                         Alphabet

    Darwin's Voyage   <- Railroad, Steam Engine, Physics, Invention,
                         Navigation, Bridge Building, Engineering, Astronomy,
                         Construction, Literacy, Mathematics, Mysticism,
                         Currency, Iron Working, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Women's Suffrage  <- Industrialization, Railroad, Steam Engine, Physics,
                         Invention, Banking, Navigation, Bridge Building,
                         Engineering, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Hoover Dam        <- Electronics, Electricity, Metallurgy, Magnetism,
                         Gunpowder, Physics, Invention, University,
                         Navigation, Engineering, Philosophy, Astronomy,
                         Construction, Literacy, Mathematics, Mysticism,
                         Currency, Iron Working, Code of Laws, Writing,
                         Map Making, The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    United Nations    <- Communism, Industrialization, Railroad,
                         Steam Engine, Physics, Invention, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    SETI Program      <- Computers, Electronics, Electricity, Metallurgy,
                         Magnetism, Gunpowder, Physics, Invention,
                         University, Navigation, Engineering, Philosophy,
                         Astronomy, Construction, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Cure for Cancer   <- Genetic Eng., Corporation, Industrialization,
                         Railroad, Steam Engine, Physics, Invention,
                         Medicine, Banking, Navigation, Bridge Building,
                         Engineering, Philosophy, Republic, Astronomy,
                         Construction, Trade, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Manhattan Project <- Nuclear Fission, Mass Production, Automobile,
                         Combustion, Refining, Corporation, Steel,
                         Industrialization, Railroad, Metallurgy, Explosives,
                         Atomic Theory, Steam Engine, Gunpowder,
                         Theory of Gravity, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    Apollo Program    <- Space Flight, Rocketry, Advanced Flight, Flight,
                         Combustion, Refining, Computers, Corporation,
                         Electronics, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet



    UNITS
    -----

    Chariot           <- The Wheel

    Cavalry           <- Horseback Riding

    Diplomat          <- Writing, Alphabet

    Trireme           <- MapMaking, Alphabet

    Legion            <- Iron Working, Bronze Working

    Catapult          <- Mathematics, Masonry, Alphabet

    Caravan           <- Trade, Currency, Code of Laws, Bronze Working,
                         Alphabet

    Sail              <- Navigation, Astronomy, Mathematics, Mysticism,
                         Map Making, Masonry, Ceremonial Burial, Alphabet

    Knight            <- Chivalry, Feudalism, Monarchy, Code of Laws,
                         Horseback Riding, Masonry, Ceremonial Burial,
                         Alphabet

    Musketeer         <- Gunpowder, Invention, Engineering, Construction,
                         Literacy, Currency, Iron Working, Code of Laws,
                         Writing, The Wheel, Masonry, Bronze Working,
                         Alphabet

    Frigate           <- Magnetism, Physics, Navigation, Astronomy,
                         Mathematics, Mysticism, Map Making, Masonry,
                         Ceremonial Burial, Alphabet

    Ironclad          <- Steam Engine, Physics, Invention, Navigation,
                         Engineering, Astronomy, Construction, Literacy,
                         Mathematics, Mysticism, Currency, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Cannon            <- Metallurgy, Gunpowder, Invention, University,
                         Engineering, Philosophy, Construction, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Rifleman          <- Conscription, Explosives, Gunpowder, Chemistry,
                         Invention, University, Medicine, Engineering,
                         Philosophy, Republic, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Transport         <- Industrialization, Railroad, Steam Engine, Physics,
                         Invention, Banking, Navigation, Bridge Building,
                         Engineering, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Battleship        <- Steel, Industrialization, Railroad, Metallurgy,
                         Steam Engine, Gunpowder, Physics, Invention,
                         University, Banking, Navigation, Bridge Building,
                         Engineering, Philosophy, Republic, Astronomy,
                         Construction, Trade, Literacy, Mathematics,
                         Mysticism, Currency, Iron Working, Code of Laws,
                         Writing, Map Making, The Wheel, Masonry,
                         Ceremonial Burial, Bronze Working, Alphabet

    Cruiser           <- Combustion, Refining, Corporation,
                         Industrialization, Railroad, Explosives,
                         Steam Engine, Gunpowder, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Armor             <- Automobile, Combustion, Refining, Corporation,
                         Steel, Industrialization, Railroad, Metallurgy,
                         Explosives, Steam Engine, Gunpowder, Chemistry,
                         Physics, Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Fighter           <- Flight, Combustion, Refining, Corporation,
                         Industrialization, Railroad, Explosives,
                         Steam Engine, Gunpowder, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Submarine         <- Mass Production, Automobile, Combustion, Refining,
                         Corporation, Steel, Industrialization, Railroad,
                         Metallurgy, Explosives, Steam Engine, Gunpowder,
                         Chemistry, Physics, Invention, University, Medicine,
                         Banking, Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Bomber            <- Advanced Flight, Flight, Combustion, Refining,
                         Corporation, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    Carrier           <- Advanced Flight, Flight, Combustion, Refining,
                         Corporation, Industrialization, Electricity,
                         Railroad, Metallurgy, Explosives, Steam Engine,
                         Magnetism, Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    Mech Infantry     <- Labor Union, Mass Production, Automobile,
                         Combustion, Refining, Communism, Corporation, Steel,
                         Industrialization, Railroad, Metallurgy, Explosives,
                         Steam Engine, Gunpowder, Chemistry, Physics,
                         Invention, University, Medicine, Banking,
                         Navigation, Bridge Building, Engineering,
                         Philosophy, Republic, Astronomy, Construction,
                         Trade, Literacy, Mathematics, Mysticism, Currency,
                         Iron Working, Code of Laws, Writing, Map Making,
                         The Wheel, Masonry, Ceremonial Burial,
                         Bronze Working, Alphabet

    Nuclear Unit      <- Rocketry, Advanced Flight, Flight, Combustion,
                         Refining, Corporation, Electronics,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

    Artillery         <- Robotics, Plastic, Space Flight, Rocketry,
                         Advanced Flight, Flight, Combustion, Refining,
                         Computers, Corporation, Electronics,
                         Industrialization, Electricity, Railroad,
                         Metallurgy, Explosives, Steam Engine, Magnetism,
                         Gunpowder, Chemistry, Physics, Invention,
                         University, Medicine, Banking, Navigation,
                         Bridge Building, Engineering, Philosophy, Republic,
                         Astronomy, Construction, Trade, Literacy,
                         Mathematics, Mysticism, Currency, Iron Working,
                         Code of Laws, Writing, Map Making, The Wheel,
                         Masonry, Ceremonial Burial, Bronze Working,
                         Alphabet

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