Secret warfare
Subtitle: the battle of codes and cyphers
By: Bruce Norman.
Series: A David & Charles military book; Battle standards; Battle standards (Newton Abbot, England)
Publisher: David & Charles Publishers; Distributed in the U.S. by Sterling Pub. Co.
Published: 1989
Place of publication: Newton Abbot, Devon; New York, NY
Language: eng
Number of pages: 187
Subjects: Cryptography -- History.; Military intelligence -- History.; Ciphers -- History.
Notes: Includes index.