Product Overview
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.
- UPC:
- 9780590026062
- Binding:
- Paperback
- Publication Date:
- 9/1/1973
- Author:
- John Lawrence Peterson
- Language:
- english
- Edition:
- First Edition
Brand: Black Dog Leventhal Publishers
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