Beyond Top Secret Ultra.
Edition: 1st American ed. --
Publisher: Coward, McCann & Geoghegan
Published: 1978
Place of publication: New York
Language: eng
Number of pages: 192
Subjects: Montagu, Ewen, Hon., 1901-; World War, 1939-1945 -- Cryptography; World War, 1939-1945 -- Personal narratives, British.; World War, 1939-1945 -- Secret service -- 
Notes: First published in 1977 under title: Beyond Top Secret U. Includes index.