The code breakers of Room 40 ; the story of Admiral Sir William Hall, genius of British counter-intelligence.

Bibliographic Details
Main Author:	James, W. M. (William Milbourne), 1881-1973
Format:	Book
Language:	English
Published:	New York : St. Martin's Press, 1956.
Subjects:	Hall, William Reginald, > 1870-1943. World War, 1914-1918 > Secret service > Great Britain.

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