The knowhow book of codes, secret agents & spies
By: [written and devised by Falcon Travis and Judy Hindley ; illustrated by Colin King].
Contributors: Hindley, Judy, joint author.; King, Colin, 1943-
Series: The Knowhow books
Publisher: Corwin Books
Published: 1976
Place of publication: New York
Language: eng
Number of pages: 47
Subjects: Espionage -- Juvenile literature.; Ciphers -- Juvenile literature.; Espionage.; Ciphers.
Description: Discusses codes, maps, hidden messages, signals, disguises, and other secretive activities.
Notes: Includes index.