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The Code Breakers of Room 40: the Story of Admiral Sir William Hall, Genius of British Counter-Intelligence
The Code Breakers of Room 40: the Story of Admiral Sir William Hall, Genius of British Counter-Intelligence
By Admiral Sir William James
St. Martin's Press, 1956, 212 pp
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Along with some biographical features, this book tells, somewhat episodically, of Admiral Sir William Reginald Hall's important counter-espionage work in the First World War.

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