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Subject (Era)
- 20th century16,356
- 19th century6,957
- 21st century4,705
- 18th century3,715
- 17th century3,245
- 1945-1,838
- 16th century1,244
- Civil War, 1861-1865979
- Civil War, 1642-1649912
- 1900-1999871
- Revolution, 1775-1783851
- To 1500818
- 1989-789
- Colonial period, ca. 1600-1775651
- 1945-1989555
- 2000-2099488
- Early modern, 1500-1700472
- 1960-454
- 1991-394
- 1918-1945360