Product Type
Condition
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Collectible Attributes
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Published by Crypto-Mechanics Institute, 1974
Seller: Alcuin Books, ABAA/ILAB, Scottsdale, AZ, U.S.A.
Stapled Wraps. Condition: Fine. 4to - over 9¾" - 12" tall. 55p. An unmarked copy of Walter Penney's puzzles and cryptographic ideas. He worked for the National Security Agency for 34 years and was famous for his Problems of the Month which delighted subscribers from 1966-1974.