Elementary cryptanalysis
Subtitle: a study of ciphers and their solution
By: by Helen Fouché Gaines; sponsored by American Cryptogram Association.
Publisher: American Photographic Pub. Co.
Published: 1939
Place of publication: Boston
Language: eng
Number of pages: 230
Subjects: Cryptography.; Ciphers.
Notes: "Bibliography by W.D. Witt": p. [224]-225.