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Cover of The kids' book of secret codes, signals, and ciphers

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The kids' book of secret codes, signals, and ciphers

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Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.

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Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.

M

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"Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages."

— Margaret

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