Secrets With Ciphers and Codes

Secrets With Ciphers and Codes

Book - 1969
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Introduces ten encoding methods using numbers, rearranged letters, colored squares and dots, and other systems. Provides a message to decipher with each method.
Publisher: [New York] : Macmillan, [1969]
Characteristics: 32 p. col. illus. 22 cm
Additional Contributors: Tremain, Ruthven - Illustrator


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