Top secret Ultra
By: Peter Calvocoressi.
Edition: New ed.
Publisher: M & M Baldwin
Published: 2001
Place of publication: Cleobury Mortimer, Kidderminster, England
Language: eng
Number of pages: 158
Subjects: Calvocoressi, Peter.; Great Britain. Government Communications Headquarters -- History.; Cryptographers -- Great Britain -- Biography.; World War, 1939-1945 -- Personal narratives, English.; World War, 1939-1945 -- Cryptography.; World War, 1939-1945 -- Secret service -- Great Britain.
Genres: Biography.; Personal narratives, English.
Notes: Includes bibliographical references (p. 151-152) and index.