All kinds of codes
By: by Walt Babson.
Publisher: Four Winds Press
Published: 1976
Place of publication: New York
Language: eng
Number of pages: 135
Subjects: Cryptography -- Juvenile literature.; Ciphers -- Juvenile literature.; Cryptography.; Ciphers.
Description: An introduction to the world of codes and how to write and break them.
Notes: Includes index.