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Subject (Era)
- 20th century8,189
- 19th century4,188
- 21st century2,155
- 18th century2,087
- 17th century1,344
- Civil War, 1861-18651,036
- Civil War, 1642-1649758
- 1945-740
- Revolution, 1789-1799734
- Revolution, 1775-1783599
- 16th century591
- 1900-1999498
- To 1500396
- Revolution, 1917-1921374
- 1800-1899321
- Colonial period, ca. 1600-1775318
- Ottoman Empire, 1288-1918309
- 1918-1945308
- Early church, ca. 30-600308
- Commonwealth and Protectorate, 1649-1660287