Codes, ciphers and secret writing.
By: Illustrated by Jenny Thorne and Oxford Illustrators Ltd.
Publisher: Hamlyn
Published: 1973
Place of publication: London; New York
Language: eng
Number of pages: 77
Subjects: Cryptography -- Juvenile literature.; Ciphers.
Description: Describes various types of codes and ciphers giving examples of their use.
Notes: Includes index.