How to Write Codes and Send Secret Messages

How to Write Codes and Send Secret Messages

Book - 1966
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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 : Scholastic Book Services, c1966.
ISBN: 9780590070560
Characteristics: 64 pages :,color illustrations ;,15 x 21 cm.
Additional Contributors: Myers, Bernice - Illustrator


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