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- World War, 1914-1918242
- Campaigns50
- Territorial questions29
- Boundaries17
- History16
- World War (1914-1918)13
- Maps9
- Ethnology7
- Military campaigns7
- Real property6
- Treaties6
- Landowners5
- Politics and government5
- Administrative and political divisions4
- International relations4
- Trench warfare4
- Argonne, Battle of the, France, 19183
- Atlases3
- Battlefields3
- Peace3