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Subject (Era)
- 20th century13,946
- 19th century5,816
- 21st century3,001
- 18th century2,068
- 17th century1,831
- Civil War, 1861-18651,467
- 1945-1,137
- 1900-1999892
- 16th century673
- 1933-1945585
- 1918-1945580
- Revolution, 1775-1783568
- 1989-538
- 2000-2099463
- 1945-1989462
- 1800-1899415
- To 1500414
- 1990-340
- Colonial period, ca. 1600-1775339
- 1918-1933320