Solving German codes in World War I : [with an added special "code problem" for the student] /

Bibliographic Details
Main Author:	Friedman, William F. (William Frederick), 1891-1969
Format:	Book
Language:	English
Published:	Laguna Hills, Calif. : Aegean Park Press, [1977]
Series:	Cryptographic series ; 11.
Subjects:	Cryptography. World War, 1914-1918 > Communications. Ciphers.

Description
Physical Description:	ix, 152 pages : illustrations ; 28 cm.