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- World War, 1939-19453,719
- World War (1939-1945)804
- History632
- Secret service504
- Underground movements404
- Campaigns312
- Underground movements, War162
- Prisoners and prisons, German120
- Military campaigns115
- Japanese Americans105
- Politics and government103
- Cryptography94
- Forced removal and internment, 1942-194592
- World War85
- Military intelligence80
- Spies78
- Concentration camps77
- Escapes73
- Propaganda67
- Military operations, Aerial65