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- Military intelligence34
- History31
- Intelligence service6
- Secret service6
- Foreign relations4
- Military history, Modern4
- Diplomatic relations3
- Armies2
- Command of troops2
- Communications, Military2
- Description and travel2
- Dreyfus, Alfred, 1859-19352
- Espionage, British2
- Geographers2
- Intelligence officers2
- Napoleonic Wars, 1800-18152
- Politics and government2
- Przhevalʹskiĭ, Nikolaĭ Mikhaĭlovich, 1839-18882
- Spies2
- Staffs2