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Subject (Era)
- 20th century13,678
- 19th century6,320
- 21st century3,319
- 18th century2,780
- 17th century1,991
- Civil War, 1861-18651,368
- 1945-1,358
- 1900-1999829
- 16th century744
- 1933-1945658
- To 1500613
- Revolution, 1775-1783583
- 1989-480
- Civil War, 1936-1939416
- 1918-1945407
- 1990-398
- 2000-2099396
- 1800-1899393
- Revolution, 1789-1799389
- Colonial period, ca. 1600-1775384