DECIPHERING "THE MOST MYSTERIOUS
                 MANUSCRIPT IN THE WORLD" THE FINAL WORD?
                            by Michael Theroux

"The intelligent reader will judge for himself. Without examining the facts
fully and fairly, there is no way of knowing whether vox populi is really
vox dei, or merely vox asinorum." Cyrus H. Gordon, from Riddles in History

INTRODUCTION
Contemporary and Not So Contemporary Cryptography
It is always unfortunate to find another science which has fallen prey to
the whims of the so-called "schools of thought". Unfortunately, it would
appear that the science of Cryptography has become their latest victim, and
seems to be directly linked to the introduction of the computer, and the
use of its ability to perform "high math". Let us not forget, that the
science of Cryptography is not a science of numbers, but one of
words....symbols. Written language is cryptography in its purest sense. It
follows no laws or rules as does the science of mathematics. It is creative
and spontaneous. The ancient scribes with their acrostic-telestic
inscriptions, anagrams, and bi-literal ciphers (to name but a few methods
used), would wholly agree, and realized that the purest cipher was one that
was not revealed as a cipher. The ancients were as intelligent if not more
so than we consider ourselves today, and manipulated language so deftly
that it often takes modern scholars a long time to grasp the presence, let
alone all the subtleties, of ancient riddles. These ancient
"steganographers" utilized their creative art to conceal the messages of
their day.

Today's "encryption" schemes with all their lifeless algorithms are not the
engines of ingenuity they claim to be, but are merely simplistic number
scramblers. As a writer of several such computer programs, I have found
them to be quite interesting, but nonetheless an adventure into a very
limited and somewhat non-creative avocation. They may have their purpose in
the transmission of data, but the messages they render unintelligible
disclose the fact that they contain concealed information, and hold no
value aesthetically as far as cryptographic writing is concerned. There
simply is no vision in creating machines which spew forth deluges of
riffled characters. Of course, the cryptographic orthodoxy would reel at
this statement as they try ever harder to find the perfect algorithm, or
struggle with the endless factoring of streams of numbers. Their view is
toward unification and adoption of standards in the cryptographic sciences,
thus putting to rest any sense of creative vision.

The true art of Steganography (a method by which a message can be disguised
by making it appear to read or be something else) is one such creative form
of cryptography that has been lost (possibly purposely) and seems to have
gone the way of most secrets of ancient knowledge. A classic example of
this lack of vision by the "authorities" in cryptography is their
detraction of William Romaine Newbold's decipherment of the Voynich
Manuscript. There are many reasons, which will be detailed here, why many
had derogated Newbold's findings. For instance, if Newbold's assertions
were correct, scientific history would have to be re-written. Such is the
importance of this most incredible document. In the following pages I shall
not only give a detailed history of what has been referred to as "most
mysterious manuscript in the world", but will show that Newbold most likely
did solve the cipher of the Voynich manuscript, and was probably the only
one of his day qualified to do so.

HISTORY OF THE VOYNICH MANUSCRIPT
In order to understand the nature of this undertaking it is necessary to
describe the Voynich manuscript (hereinafter referred to as "MS") and
detail its most curious history. The Voynich MS is so named after Wilfrid
M. Voynich, a well known bibliophile from New York. In 1912, during one of
Mr. Voynich's many visits to Europe in quest of old and rare books, he came
across a remarkable collection of precious manuscripts. These volumes had
been buried in a chest and remained hidden inside a castle in Southern
Italy for decades. While he was perusing the manuscripts for purchase, his
attention was particularly drawn to one odd, out of place looking bundle.
Examination revealed the MS to be written entirely in cipher. Even a brief
inspection of the vellum upon which it was written, the calligraphy, the
drawings, and the pigments suggested its date of origin as the latter part
of the thirteenth century. It was not until some time after Mr. Voynich
purchased the MS that he read the document attached to the front cover
bearing the date 1665 (or 1666). It is a letter from Joannes Marcus Marci,
rector of the University of Prague, to Athanasius Kircher, a Jesuit
scholar, presenting the MS as a gift to Kircher. Its most important
significance can be seen from the following translation of it:

REVEREND AND DISTINGUISHED SIR, FATHER IN CHRIST:

This book, bequeathed to me by an intimate friend, I destined
for you, my very dear Athanasius, as soon as it came into my
possession, for I was convinced it could be read by no one except
yourself.
The former owner of this book asked your opinion by letter,
copying and sending you a portion of the book from which he
believed you would be able to read the remainder, but he at that
time refused to send the book itself. To its deciphering he devoted
unflagging toil, as is apparent from attempts of his which I send
you herewith, and he relinquished hope only with his life. But his
toil was in vain, for such Sphinxes as these obey no one but their
master, Kircher. Accept now this token, such as it is and long
overdue though it be, of my affection for you, and burst through its
bars, if there are any, with your wonted success.
Dr. Raphael, tutor in the Bohemian language to Ferdinand Ill,
then King of Bohemia, told me the said book had belonged to the
Emperor Rudolph and that he presented to the bearer who brought
him the book 600 ducats. He believed the author was Roger
Bacon, the Englishman. On this point I suspend judgment; it is
your place to define for us what view we should take thereon, to
whose favor and kindness I unreservedly commit myself and
remain,
At the command of your Reverence,
JOANNES MARCUS MARCI,
of Cronland.
PRAGUE, 19th August, 1665 (or I666).

The key, here, is that the un-named "bearer" believed the author was Roger
Bacon, the 13th century Franciscan monk, philosopher, magician, and
alchemist. Bacon had been persecuted for his writings and scientific
discoveries, and referred in his works to the necessity of hiding his great
secrets in cipher. This emphasis on Roger Bacon's authorship will become
clear in later development. One should not confuse Roger Bacon with the
Renaissance figure Francis Bacon (F. Bacon was also quite prolific on
ciphering tecniques) The testimony in the letter of Dr. Raphael, that the
MS was once in the possession of Emperor Rudolph is fairly determinative.
The signature of Jacobus de Tepenecz found inside the MS confirms the fact
that the MS found its way to the Emperor's court, as de Tepenecz was
ennobled and befriended by the Emperor in 1608, and lived at his palace.

Further investigation by Mr. Voynich revealed that the MS had been in the
possession of Dr. John Dee, the 16th century astrologer and magician. Dee
had spent the years between 1584 and 1588 at Rudolph's court as a secret
agent of Queen Elizabeth I, and probably brought the MS to Prague. Dee was
an admirer of Bacon and collected many of his works (a catalogue of Dee's
library prepared in 1583 enumerates thirty-seven works of Bacon). Sir
Thomas Browne, the inventor of the English word 'cryptography', claimed
that Dee's son Arthur had spoken to him about a 'book containing nothing
but hieroglyphiks, which book his father bestowed much time upon, but I
could not hear that he could make it out'.

If we are to go back any further we might speculate that Dee obtained a
good portion of his Bacon collection from the Northumberland family. It is
known that Dee was closely associated with the Duchess of Northumberland,
and that the Duke of Northumberland received the spoils from the
dissolution of monasteries which began around 1538. It is presumed that
from these spoils, the Duke (or more likely the Duchess) of Northumberland
presented Dee with the MS.

A BRIEF SKETCH OF THE CONTENTS OF THE VOYNICH MS
The Voynich MS is a small quarto averaging about 6 by 9 inches. The MS now
contains the equivalent of 246 quarto pages, but may have originally
contained not less than 262 pages. 33 pages contain text only, 212 with
text and drawings, and the last page contains the Key. The text is written
in an enciphered script, and the drawings are colored in red, blue, brown,
yellow, and green. The contents of the MS is divided up into 5 categories.
the first, and largest section contains 130 pages of plant drawings with
accompanying text, and is called the Botanical division. The second
contains 26 pages of drawings, obviously astrological and astronomical in
nature. The third section contains 4 pages of text and 28 drawings which
would appear to be biological in nature.

The fourth division contains 34 pages of drawings which are pharmaceutical
in nature. The last section of the MS contains 23 pages of text arranged in
short paragraphs, each beginning with a star. The last page (the 24th of
this division) contains the Key only.

VOYNICH AND NEWBOLD
After considerable historical research, Mr. Voynich submitted the MS to
several cryptographers. When the symbols in the MS had been copied and
classified, their appearance and frequency were found to be consistent
throughout, and seemed to have been composed in a single-alphabet
substitution cipher. But this did not appear to be the case, much to the
dismay of the cryptographers, and they could not extract an intelligible
message in any language from the text. The MS was then surrendered to
several botanists and astronomers (due to the nature of the drawings) and
to many experts in ancient languages � all to no avail. Realizing the
possibility that the MS might require the interpretation of someone versed
in cabalistic lore (Roger Bacon was no stranger to this) Voynich finally
turned over the MS to Dr. William Romaine Newbold, of the University of
Pennsylvania, and one of the greatest students of medieval philosophy and
science. Newbold possessed the advantage that he was familiar with medieval
methods of thought, was versed in occult sciences, and, he was also a
cryptographer. Newbold started work on deciphering the Voynich MS in 1919.

NEWBOLD'S DECIPHERMENT WITH SOME CONCLUSIONS
When Newbold first attacked the MS for decipherment, he realized that he
needed to find a key which would allow him to understand how the MS was
enciphered. On the last page of the MS was written a single sentence:

"michiton oladabas multos te tccr cerc portas"

Disregarding the obvious nulls used in the sentence (ton ola te tccr cerc)
and exchanging the "o" in "multos" for "a", the intelligible Latin sentence
emerges:

"michi dabas multas portas"

translating into English, "To me thou gavest many gates."

Counting the number of letters in the sentence reveals it to be 22. Newbold
then adapted the Latin alphabet to it omitting the letter "k", replacing
"x" with "v" and produced the first form of the cipher alphabet used by
Bacon:

m i c h i d a b a s m u l t a s p o r t a s
a b c d e f g h i l m n o p q r s t u v y z

Here is what makes Newbold's qualifications for decipherment of the MS so
felicitous. Newbold understood that a major clue was to be found in the
word "portas", in that its interpreted cabalistic meaning of "gates" would
be the secret to the clarification of the Key. Newbold knew that Bacon was
well acquainted with the Cabala and would have used such a plan in his Key,
for in Bacon's Epistle on the Nullity of Magic, where he details several
ciphering systems, the sixth such system is called, "The Kabbalah of the
Nine Chambers". From Newbold's footnotes we find the following:

"In Cabalistic philosophy the universe consists of God's
thought; thought is expressed in speech; speech is composed of
letters; hence the Letters are the ultimate constituents of Things.
The ''gates" are the 231 biliteral combinations of the Hebrew
Ietters (doubles omitted; 231 permutated pairs added by later
writers); they represent the primary combinations of the highest
manifestations of the divine Being which are at once the forces
which make other things, the material of which they are made, and
the channels through which the divine energy streams forth into
the lower world. A single quotation from the Sepher Yezirah, will
suffice:
He combined (the Letters), weighed them, exchanged them,
Aleph with all and all with Aleph, Beth with all and all with Beth,
and they go (each) all the way around (the Alphabet). And they are
found (comprised) in 231 gates, and everything formed and
everything uttered is found to proceed from one Name."

Thus, "gates" not only implies a cipher of many steps, but it reveals that
the gates are the channels through which alphabetic values are conveyed
from Key Sentence to the 484 (admitting doubled letters) biliteral symbols.

With the Key now in hand, Newbold began to approach the actual text of the
MS. With more cabalistic associations appearing, Newbold discovered 22
distinct symbols, among these 22 were recognized the 15 signs that composed
the Greek system of shorthand. Bacon was quite familiar with this Greek
system, having written a grammar including such information, and reading
from the eighth chapter of Bacon's Epistle on the Nullity of Magic, we will
find the great significance he placed on secret writing, and particular
reference to the shorthand system:

"The man is insane who writes a secret in any other way than one
which will conceal it from the vulgar and make it intelligible only
with difficulty even to scientific men and earnest students. On this
point the entire body of scientific men have been agreed from the
outset, and by many methods have concealed from the vulgar all
secrets of science. For some have concealed many things by
magic figures and spells, others by mysterious and symbolic
words. For example, Aristotle in the Book of Secrets says to
Alexander, 'O Alexander, I wish to show you the greatest secret of
secrets; may the Divine Power help you to conceal the mystery
and to accomplish your aim. Take therefore the stone which is not
a stone and is in every human being and in every place and at
every time, and it is called the Egg of the Philosophers, and
Terminus of the Egg.' Innumerable examples of the kind are to be
found in many books and divers sciences, veiled in such
terminology that they cannot be understood at all without a
teacher. The third method of concealment which they have
employed is that of writing in different ways, for example, by con-
sonants alone, so that no one can read it unless he knows the
words and their meanings. In this way the Hebrews and the
Chaldaeans and Syrians and Arabs write their secrets. Indeed, as
a general thing, they write almost everything in this way, and
therefore among them, and especially among the Hebrews.
Important scientific knowledge lies hidden. For Aristotle in the
book above mentioned says that God gave them all scientific
knowledge before there were any philosophers, and that from the
Hebrews all nations received the first elements of philosophy. . . .
In the fourth place, concealment is effected by commingling letters
of various kinds; it is in this way that Ethicus the astronomer
concealed his scientific knowledge by writing it in Hebrew, Greek,
and Latin letters in the same written line. In the fifth place, certain
persons have achieved concealment by means of letters not then
used by their own race or others but arbitrarily invented by
themselves; this is the greatest obstacle of all, and Artephius has
employed it in his book On the Secrets of Nature. In the sixth
place, people invent not characters like letters, but geometrical
figures which acquire the significance of letters by means of
points and marks differently arranged; these likewise Artephius
has used in his science. In the seventh place, the greatest device
for concealment is that of shorthand, which is a method of noting
and writing down as briefly as we please and as rapidly as we
desire; by this method many secrets are written in the books of the
Latin-using peoples. I have thought fit to touch upon these
methods of concealment because I may perhaps, by reason of the
importance of my secrets, employ some of these methods, and it
is my desire to aid in this way, at least you, to the extent of my
ability."

The other 7 shorthand signs of Newbold's discovery all fit the same general
character of the first 15, and were used by Bacon to fill out the Greek
shorthand, which was lacking expression.

Newbold continued by employing the biliteral method to the converted
shorthand, and found that frequency analysis of the resultant alphabet
revealed it to be characteristic of Latin.The final stage in the process of
decipherment was the anagramming process. The process of anagramming texts
was probably the most popular method of the day used for concealing
messages, and the necessity of concealment was due to political or
ecclesiastical reasons of the time, making the information unpropitious for
pronouncement. It is known that the Cabalists were professed
anagrammatists, and the third part of their art - themuru (changing) dealt
with transposition and recombination of the letters of words for mystical
interpretation. The fact that it was also a tradition among the "orders"
can be witnessed in the works of von Bingen, and certainly in the Abbe N.
De Montfaucon De Villars' "Comte De Gabalis" (Quod tanto impendio
absconditur etiam solummodo demonstrare destruere est - Tertullian). It was
even continued with the likes of Galileo (Haec immatura a me jam frustra
leguntur - oy) Tycho Brahe (who also was at the court of Rudolph), Johannes
Kepler, and many others.

At last, the plaintext began to emerge, and without going too far afield
for the letters of anagrammed text. The letters to be rearranged occurred
in pairs next to one another, either in direct or reverse order, and only
relatively infrequently did Newbold have to go as far as three or four
words ahead in order to fill in the plaintext.

What Newbold discovered in the text was absolutely astonishing � enough to
gather a lot of attention from the scientific community. The biological
drawings in the text were described as seminiferous tubes, the microscopic
cells with nuclei, and even spermatozoa. Among the astronomical drawings
were the descriptions of spiral nebulae, a coronary eclipse, and the comet
of 1273. One of the more baffling things about this was that many of the
drawings of plants, and of the galaxies appeared to have been invented.
There was no doubt that if Bacon were the author of such a text, he must
have had some way of obtaining the information. For instance, Newbold's
translation of the caption near the drawing of the nebula of Andromeda
(which clearly shows its spiral characteristics), gave its location by the
following:

"In a concave mirror I saw a star in the form of a snail....between the
navel of Pegasus, the girdle of Andromeda, and the head of Cassiopea".

Now, Bacon is credited with the invention of the magnifying glass, but it
should be certain that he did not invent the telescope or the microscope as
many at the time of this discovery conjectured. The "concave mirror" is
probably the single most important clue here. Many of the later prominent
Renaissance figures would not only describe similar visions of travel to
distant places, several also included such "shew stones" as their viewing
apparatus. In the works of Dee, Kircher, and even the more famous
Nostradamus, one will find reference to such a device, and in each case
these individuals recorded the experience of visions associated with it.
Some of their descriptions were later proven to be precise. The actual
knowledge pertaining to the use of a device such as this is probably now
lost, but in any case it is most worthy of mention considering the
circumstances. Let us now turn to some of the objections to Newbold's
decipherment of the MS.

NEWBOLD'S DETRACTORS - AND HIS VALIDATION
Initially, upon the announcement of his findings in 1921, Newbold received
some praise for his work. Even John M. Manly, a military intelligence
cryptanalyst, wrote a favourable review in Harper's Magazine. But, this was
not to last very long, and soon the attacks proceeded. The first of such
attacks came from research chemists who stated that the rough vellum
surface upon which the MS was written had caused the ink to break up into
spots and shadings with age. This break up of characters, they stated, was
what Newbold had actually seen when deciphering the shorthand characters.

This criticism that the ink had merely broken up into spots and shadings
due to age was unfounded due to the fact that many documents nearly as aged
as the Voynich MS, with comparable ink, do not display cracking similar to
the individual characters in the MS. Also, if the arrangement of characters
was due to this breaking up of the ink, certainly more than 22 individual
shorthand symbols would have been discovered by Newbold.

The next attack was concerned with the biliteral method of Newbold's
decipherment. Cryptographers stated that by Newbold's methods, Bacon could
not have enciphered the text to begin with. But, Newbold clearly detailed
the enciphering process, and revealed that Bacon did not use "orthodox"
methods of enciphering to which the cryptographers were accustomed.

Attacked most heavily of all was the anagramming process Newbold used.
These detractors maintained that one could anagram any text into anything
one chose, and that this method would not have followed the qualifications
of a "good" cipher, in that the first quality of any "good" cipher is that
it must convey its message with absolute certainty. Newbold's anagramming
process did NOT use "blocks of 55 to 110 characters", as had been put forth
by these detractors, on the contrary, it can be shown from his own notes
that he was very careful in his observations:

"The only indication that the recomposition is correct is the regular
appearance, at intervals of NOT more than three or four words, of
letter groups suggesting words appropriate, in syntax and logic, to
the preceding text. If they fail to appear, if one is driven to
arbitrary choice in order to make sense, the recomposition is
probably WRONG." (emphasis mine)

I have observed this misrepresentation of facts of Newbold's decipherment
in a number of works (David Kahn's gigantic work entitled The Codebreakers
immediately comes to mind) and find it quite an admonition to any other
statements made by such authors. The fact that his detractors used such
methods to anagram texts into any messages they seemed fit � designed to
expose flaws in Newbold's decipherment � is clearly disinformation.
Newbold, by HIS method, equally tried other texts of the period including
works of Bacon which were not meant to be in cipher, and while he could
form Latin words for a time, he was soon left with unmanageable groups of
consonants, and discontinued the experiment, as Latin requires between 40
and 50 percent vowels.

It wasn't until after Newbold's death in 1926 that more serious assaults
would come. In 1931 John Manly (who earlier gave praise) published a 47
page article in Speculum Magazine of what he called "a detailed analysis"
that attempted to make Newbold's work seem entirely worthless. But many
more would hinge their depreciations on Newbold's interpretation of the
drawings contained in the MS. Most said that the biological pictures were
cabalistic (they certainly were!), symbolical, vague, and capable of
various interpretations. I must note that I personally have given these
biological drawings to persons well credentialed in the field of Biology,
and asked them to give me an explanation of what they see in them. In every
instance, and without any prior knowledge of the MS, they have given
descriptions which very closely resemble the deciphered interpretations of
Newbold.

Other assailants made particular note of the drawing which represented the
nebula Andromeda. Based on the fact that the spiral nebula in Andromeda
lies edge on to earthly observers, Bacon would have had to have an
incredibly powerful telescope to view such a thing. But, as we have noted,
no one was really claiming that he did.

It may be deduced from these painstaking onslaughts that maybe these
assailants felt it was necessary to hide the true nature of the work. In
Manly's 1931 article, he blatantly reveals his real concerns with the
warning to all that, "these results (of Newbold's) threaten to falsify to
no unimportant degree, the history of human thought." Kahn, in The
Codebreakers, devotes several pages to the MS decipherment, and groups
Newbold into a category he later describes as oddballs and lunatics who
believe in such things as the Hollow Earth, dowsing, Atlantis, flying
saucers, and radionics.

Of course, the depreciated Newbold decipherment did not discourage others
from attempting to figure out the MS, and a few of the arguments put
forward may have been somewhat conceivable. In 1944, Professor Hugh O'Neil,
a botanist at the Catholic University of America, offered evidence that the
MS could not have been written before 1493. He observed that the drawings
in the MS include the likes of the common sunflower, and Capsicum, both
plants native to the Americas which according to him, were unknown to
Europeans before the return of Columbus from his second voyage. We needn't
go into the Columbus discovery here, as historically it is well known that
he was hardly the first to venture to the Americas.

Not long after O'Neil's observations, Dr. Leonell Strong, a cancer research
scientist and amateur cryptographer, took on the project of deciphering the
MS. Fancifully boasting that he could "unravel" the secret of any cipher,
Strong said that the solution to the MS cipher was a "peculiar double
system of arithmetical progressions of a multiple alphabet". Even here,
there was a great similarity to Newbold's system, but Strong altogether
bombastically stated that the plaintext revealed the MS to be written by
the 16th century English author Anthony Ascham, whose works include A
Little Herbal, published in 1550. Although the MS does contain one section
resembling an herbal, it is unknown where the author of A Little Herbal
would have obtained such literary and cryptographic knowledge.

The speculation of William F. Friedmann, another military cryptographer,
was that the MS was actually a text in an artificial language, and may have
held some merit if it were not for the fact that he was also responsible,
and instrumental in the demolition of Newbold's theory (again, after
Newbold's death). But, he, too never went any further than this simple
hypothesis. Many others have invented their own versions of decipherment of
the MS, but all of them fall short of making anything intelligible out of
the mysterious characters. To the cryptographic orthodoxy, the MS is still
"undeciphered". I believe many have merely taken the disparaging words of
others as proof that the Newbold solution is bogus, without actually
examining the specifics. Had Newbold been a rank amatuer with nothing but
this decipherment for credentials, it would certainly raise some doubt.
But, Newbold indeed practised his techniques on similar manuscripts such as
the Tironian signs of the so-called Vatican Document (which I won't detail
here as it would necessitate the space of an entire article in itself) and
many others. It is most probable though, that the Voynich MS actually cost
Newbold his health, both physically and mentally. In the latter days of his
work on the MS he began to grow weary and would often restructure his
entire method without any sense of reason. Still, the heart of Newbold's
inspiration lies in his initial work on the MS, and there has not been
anyone since who has even come close to the original genius of his solution
to "the most mysterious manuscript in the world".

REFERENCES
1. The Cipher of Roger Bacon by William Romaine Newbold,
edited by Roland Grubb Kent. University of Pennsylvania Press,
1928.
2. Secret and Urgent -The Story of Codes and Ciphers by Fletcher
Pratt. Blue Ribbon Books, 1942.
3. The Secret Teachings of All Ages by Manly Palmer Hall.
Philosophical Research Society, 1977.
4. Cryptography - The Science of Secret Writing by Lawrence
Dwight Smith. W.W. Norton, 1943.
5. Opus Majus by Roger Bacon. Complete Latin version by
Howard R. Bayne, 1946.
6. Comte De Gabalis by the Abbe N. De Montfaucon De Villars.
Paris 1670.
7. "The Incredible Roger Bacon" by Manley Mills. Fate, April 1951,
pp 69-72.
8. "Cipher of the Secret Book" by Betty McKaig (Interview with
Leonell Strong). North County Independent, Oct. 7, 1970.
9. "The Insignificant Cry of Roger Bacon" by Malachi Martin.
Intellectual Digest, August, 1972. pp 52-55.
10. "Codes and Ciphers" by Peter Way - Encyclopedia of Espionage,
Aldus Books London, 1977.
11. Oddities and Curiosities of Words and Literature by C. C.
Bombaugh. J. B. Lippincott, 1890.
12. Riddles in History by Cyrus H. Gordon. Crown Publishers,
1974.
13. A True and Faithful Relation of What Passed for Many Years
Between Dr. John Dee...and Some Spirits. Edited by Meric
Casaubon. London, 1659.
14. The Hieroglyphic Monad by Dr. John Dee translated by J. W.
Hamilton-Jones. Neil & Co. Edinburgh, 1947.
15. The Curious Lore of Precious Stones pp 188-196
16. The Codebreakers by David Kahn. McMillan Co., 1967.

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