Grade
3-4
E. A. Grant
The Kids' Book of Secret Codes, Signals and Ciphers
Paperback
(Running Pr Book Pub Nov. 1, 1989)
, First Edition edition
Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.
- ISBN
- 0894717812 / 9780894717819
- Pages
- 80
- Weight
- 4.8 oz.
- Dimensions
- 6.2 x 0.2 in.