Codes & mystery messages

Front Cover
Childrens Press, Dec 1, 1975 - Juvenile Nonfiction - 46 pages
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Explains how to create various kinds of codes and discusses other means of sending messages, such as Indian sign language, brands, and flag signals.

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Contents

CryptoMachine
6
More Invisible Ink
12
Pig Languages
24
Copyright

2 other sections not shown

Common terms and phrases