The Ultra secret
By: F. W. Winterbotham.
Publisher: Weidenfeld and Nicolson; Orion Publishing Group, Limited
Published: 1974
Place of publication: London
Language: eng
Number of pages: 199
Subjects: Winterbotham, F. W. 1897-; World War, 1939-1945 -- Cryptography.; World War, 1939-1945 -- Secret service -- Great Britain.; World War, 1939-1945 -- Personal narratives, British.
Genres: Personal narratives, British.
Notes: Includes index.