Pollard Memorial Library (Lowell)
940.54/85
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940.54/85
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940.54/85
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Top secret tales of World War II, William B. Breuer
Bodyguard of lies, Anthony Cave Brown. --
Seizing the enigma, the race to break the German U-boat codes, 1939-1943, David Kahn
The secret history of World War II, spies, code breakers & covert operations, Neil Kagan, Stephen G. Hyslop ; foreword by Kenneth W. Rendell
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