Items related to How to Write Codes and Send Secret Messages
Explains how to write and decipher space codes, hidden word codes, and alphabet codes and gives formulas for invisible ink. Includes suggestions for delivering coded messages.
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- PublisherImprint unknown
- Publication date1979
- ISBN 10 0590720007
- ISBN 13 9780590720007
- BindingPaperback
- Number of pages64
- Rating
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