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- World War, 1914-191857,181
- History8,189
- Campaigns4,737
- Politics and government2,838
- Economic aspects2,685
- Causes2,650
- Foreign relations2,175
- Territorial questions1,936
- World War (1914-1918)1,868
- Peace1,526
- Soldiers1,479
- Regimental histories1,450
- Naval operations1,352
- World War, 1939-19451,221
- Finance1,186
- Diplomatic history1,145
- History, Military1,083
- Reparations998
- Economic conditions854
- Atrocities802