The kids' book of secret codes, signals, and ciphers
By: E.A. Grant.
Publisher: Running Press
Published: 1989
Place of publication: Philadelphia, Pa
Language: eng
Number of pages: 80
Subjects: Cryptography -- Juvenile literature; Ciphers -- Juvenile literature
Genres: Juvenile literature
Description: Discusses the history and different varieties of codes and ciphers, describing code machines, signals, sign language, picture languages, and hidden messages.
Notes: j-142,078

Includes index.