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Pages: 175, Paperback, Independently published
Dutton Books for Young Readers
Mysterious Messages: A History of Codes and Ciphers
Ulysses Press
the Six Unsolved Ciphers: Inside Mysterious Codes That Have Confounded World's Greatest Cryptographers
DK
Enola Holmes Book of Puzzles: Solve Ciphers, Codes and Conundrums
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