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Subject (Era)
- 20th century19,442
- 19th century9,492
- 21st century3,529
- 18th century3,065
- 17th century1,534
- 1900-19991,413
- 16th century865
- Civil War, 1861-1865737
- To 1500707
- 2000-2099589
- Middle Ages, 500-1500569
- 1800-1899472
- Early modern, 1500-1700413
- Middle Ages, 600-1500412
- Early church, ca. 30-600304
- 1945-260
- To 500252
- Renaissance, 1450-1600240
- Colonial period, ca. 1600-1775232
- Revolution, 1789-1799226