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Subject (Era)
- 20th century158,575
- 19th century51,426
- 21st century43,314
- 18th century24,585
- 17th century16,689
- To 150010,015
- 1945-9,565
- 16th century9,451
- 1900-19999,416
- 2000-20998,073
- Revolution, 1789-17997,419
- Civil War, 1861-18656,445
- Revolution, 1775-17835,854
- 1991-5,055
- 1989-4,959
- 1933-19453,602
- 1960-3,017
- 1918-19452,945
- Early modern, 1500-17002,927
- 1990-2,912