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Subject (Era)
- 20th century7,427
- 19th century3,613
- 21st century2,317
- 18th century1,916
- 1945-860
- 1918-1945785
- Revolution, 1789-1799743
- 17th century714
- To 1500440
- Revolution, 1775-1783424
- 1900-1999407
- 16th century342
- Civil War, 1861-1865311
- 1990-302
- 1933-1945277
- 1918-219
- Unification, 1990208
- 1991-206
- To 1644201
- To 1789197