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Subject
- World War, 1914-1918326
- Causes39
- Atrocities24
- History22
- Foreign relations19
- Territorial questions19
- Guerre mondiale, 1914-191816
- Politics and government16
- Economic aspects15
- Campaigns11
- Diplomatic history11
- World War (1914-1918)10
- Peace7
- War7
- Guerre, 1914-1918 (Mondiale, 1re)6
- Economic conditions5
- Neutrality5
- Aerial operations4
- Civilization4
- Eastern question (Balkan)4