Books about World War, 1914-1918 -- Secret service -- Fiction (sorted by release date) - Project Gutenberg

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Sant of the Secret Service: Some Revelations of Spies and Spying William Le Queux Oct 25, 2012
The Man with the Clubfoot Valentine Williams Mar 9, 2005
Okewood of the Secret Service Valentine Williams Dec 1, 2000
Displaying results 1–3