Codes and Ciphers 9780007228041, 9780007551118, 0007551118

All you need to know about making and breaking codes. Gem Codes and Ciphers touches on everything from the smoke signals

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English Pages (192 pages) : color illustrations Year 2013;2014

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Codes and Ciphers
 9780007228041, 9780007551118, 0007551118

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