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Codes, Ciphers and Secret Writing by Martin Gardner 1972 HC DJ 1st Edition
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Top Secret: A Handbook of Codes, Ciphers and Secret Writing
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SECRET AND URGENT~the Story of Codes & Ciphers~by Fletcher Pratt, 1942 h/b bk
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The Spy's Guide to Secret Codes and Ciphers Jim, Melton, H. Keith
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Top Secret : A Handbook of Codes, Ciphers and Secret Writing by Paul B. Janeczko
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Top Secret: A Handbook of Codes, Ciphers and Secret Writing Very Good
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Secret Warfare: Battle of Codes and Ciphers by Bruce Norman (Hardcover, 1973)

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