The Ultra secret
By: F. W. Winterbotham.
Series: A Contact book
Publisher: Futura Publications
Published: 1975
Place of publication: London
Language: eng
Number of pages: 239
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.