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Subject (Era)
- 20th century6,492
- 19th century3,955
- 18th century2,229
- 21st century2,073
- 17th century1,788
- 16th century1,508
- 1900-1999701
- 2000-2099493
- To 1500489
- Revolution, 1775-1783478
- Civil War, 1861-1865409
- Colonial period, ca. 1600-1775389
- 1800-1899348
- 1775-1783343
- 15th and 16th centuries256
- Early modern, 1500-1700251
- 15th century214
- 1989-180
- 1945-169
- 1450-1600159