How to Write Codes and Send Secret Messages

How to Write Codes and Send Secret Messages

Book - 1970
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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.
Publisher: [New York] : Four Winds Press, 1970
ISBN: 9780590026062
Characteristics: 64 pages :,color illustrations
Additional Contributors: Myers, Bernice


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