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Codes, ciphers, and secret writing. [electronic resource]

By: Material type: TextTextPublication details: New York : Pocket Books, 1974.Description: 114 p. : ill. ; 24 cmSubject(s): Online resources: Summary: Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
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Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.

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