The Kids' Book of Secret Codes, Signals and Ciphers

By E.A. Grant

Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages. This description may be from another edition of this product.

• Format: Paperback
• Language: English
• ISBN: 0894717812
• ISBN13: 9780894717819
• Release Date: January 1989
• Publisher: Running Pr Book Pub
• Length: 80 Pages
• Weight: 3.15 lbs.
• Dimensions: 9.3" x 0.3" x 6.3"
• Age Range: 7 years and up
• Grade Range: Grade 2 and higher