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- World War, 1939-1945[remove]102
- World War (1939-1945)34
- Secret service25
- Underground movements18
- History17
- Campaigns15
- Foreign relations13
- Underground movements, War13
- Spies11
- Diplomatic history8
- Military campaigns6
- Military intelligence6
- Guerrillas5
- Politics and government5
- Espionage, Soviet4
- Diplomatic relations3
- Espionage3
- Roessler, Rudolf, 1897-19583
- Social life and customs3
- Sorge, Richard, 1895-19443