The man who broke Purple
Subtitle: the life of the world's greatest cryptologist, Colonel William F. Friedman
By: Ronald W. Clark.
Publisher: Weidenfeld & Nicolson
Published: 1977
Place of publication: London
Language: eng
Number of pages: 212
Subjects: Friedman, William F. 1891-1969.; Cryptographers -- United States -- Biography.
Notes: Includes index.