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Subject (Era)
- 20th century3,443
- 19th century2,084
- 18th century1,259
- 1900-1999937
- 17th century609
- 1939-1945588
- Civil War, 1861-1865516
- 21st century422
- 1914-1918280
- 1701-1800262
- 1861-1865234
- 2000-2099231
- Revolution, 1775-1783224
- 1800-1899179
- 1945-177
- 1854-1861126
- 1857-186196
- Early modern, 1500-170092
- 1933-194591
- 1853-185790