On ULTRA active service
Subtitle: the story of Australia's signals intelligence operations during World War II
By: by Geoffrey St. Vincent Ballard.
Publisher: Spectrum Publications
Published: 1991
Place of publication: Victoria, Aus
Language: eng
Number of pages: 312
Subjects: World War, 1939-1945 -- Electronic intelligence -- Australia.; Electronic intelligence -- Australia.; World War, 1939-1945 -- Cryptography; World War, 1939-1945 -- Military intelligence
Notes: Includes index.