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The Spy's Guide to Secret Codes and Ciphers
The Spy's Guide to Secret Codes and Ciphers Author:Jim Wiese, H. Keith Melton (Contributor) Spy University presents a fun way for young spies to learn all about secret codes and ciphers.
Features: Loads of Codes; Spy Quest: The Case of the Writing on the Chalkboard; and 12 Spy Missions.