The code breakers of Room 40
Subtitle: the story of Admiral Sir William Hall, genius of British counter-intelligence.
Publisher: St. Martin's Press
Published: 1956
Place of publication: New York
Language: eng
Number of pages: 212
Subjects: Hall, William Reginald, Sir, 1870-1943.; World War, 1914-1918 -- Secret service -- Great Britain.; Admirals -- Great Britain -- Biography.
Genres: Biography.
Notes: First published in London in 1955 under title: The eyes of the Navy.