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- World War, 1914-19181,161
- Jews113
- History69
- Missions49
- Napoleon I, Emperor of the French, 1769-182147
- Ethnology46
- Russo-Japanese War, 1904-190543
- Eastern question (Far East)37
- Pangermanism31
- Gender30
- Gender identity30
- Women30
- Neutrality29
- Bible28
- Land tenure28
- Natural history28
- Russian literature28
- Art27
- South African War, 1899-190227
- Catholic Church26