The Ultra secret
By: F.W. Winterbotham.
Publisher: Dell
Published: 1975
Place of publication: New York
Language: eng
Number of pages: 286
Subjects: Winterbotham, F. W. 1897-; World War, 1939-1945 -- Cryptography.; World War, 1939-1945 -- Secret service -- Great Britain.; World War, 1939-1945 -- Personal narratives, English.
Genres: Personal narratives, English.