Secret service in America
Subtitle: the American black chamber
By: by Herbert O. Yardley.
Publisher: Faber & Faber limited
Published: 1940
Place of publication: London
Language: eng
Number of pages: 265
Subjects: Military intelligence.; Secret service -- United States.; World War, 1914-1918 -- Secret service -- United States.; Cryptography.
Other titles: The American black chamber.
Notes: The history and work of the Cryptographic bureau, officially known as section 8 of the Military Intelligence Division (MI-8)  cf. p. 22.
First published 1931 under title: The American black chamber.