Title Codes, ciphers, and secret writing.

Publication Info.

New York : Simon and Schuster [1972]

Copies

Location	Call No.	Status
Plainville Public Library - Non Fiction	652.8 GAR	DUE 05-05-22 Billed

Description	96 pages : illustrations ; 24 cm
Bibliography	Bibliography: pages 94-96.
Summary	Explains in simple terms how to encode and decode messages in various ciphers, describes coding machines, and gives formulas for invisible ink.
Subject	Ciphers -- Juvenile literature.
	Ciphers.
ISBN	067165201X library binding

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