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Subject
- World War, 1939-194530
- History15
- Secret service11
- Sorge, Richard, 1895-19449
- Spies8
- Espionage, Soviet7
- Foreign relations7
- Cryptography6
- Atomic bomb5
- Military intelligence5
- Campaigns4
- Japanese4
- Espionage3
- Intelligence service3
- Ozaki, Hotsumi3
- Pearl Harbor (Hawaii), Attack on, 19413
- Politics and government3
- World War (1939-1945)3
- Biological warfare2
- Diplomatic relations2