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- Military intelligence453
- World War, 1939-1945452
- History198
- Secret service83
- Campaigns60
- Military interrogation52
- Patents and government-developed inventions46
- World War (1939-1945)43
- Cryptography38
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- Underground movements25
- United States. Office of Strategic Services18
- History, Military17
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- Holocaust, Jewish (1939-1945)12
- Prisoners of war11