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Subject (Era)
- 20th century18,752
- 19th century9,001
- 21st century3,406
- 18th century2,848
- 17th century1,473
- 1900-19991,325
- 16th century857
- To 1500689
- Civil War, 1861-1865670
- 2000-2099566
- Middle Ages, 500-1500564
- 1800-1899491
- Early modern, 1500-1700411
- Middle Ages, 600-1500410
- Early church, ca. 30-600305
- To 500253
- 1945-245
- Renaissance, 1450-1600241
- Revolution, 1789-1799225
- Colonial period, ca. 1600-1775219