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Hobby Cryptography : 86 Classical Ciphers Classified and Updated by Pierce, Clayton C. ISBN: 9780960156474 List Price: $25.00

Classical Ciphers by Pierce, Clayton C. ISBN: 9780960156450 List Price: $9.95

CryptoPrivacy: A Cryptographer's Manual by Pierce, Clayton C. ISBN: 9780960156443 List Price: $19.95

Cryptoprivacy A Cryptographer's Manual by Pierce, Clayton C. ISBN: 9780960156467 List Price: $14.95

Classical Ciphers by Pierce, Clayton C. ISBN: 9780960156498 List Price: $39.95

Classical Ciphers II by Pierce, Clayton C. ISBN: 9780960156429 List Price: $49.95