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Subject (Era)
- Civil War, 1861-186529,763
- 20th century19,616
- Revolution, 1775-178316,311
- 19th century8,403
- 1945-5,996
- 21st century5,666
- 1861-18655,594
- 1945-19894,594
- 1775-17834,303
- 1989-3,622
- 1933-19453,467
- War of 18123,458
- Colonial period, ca. 1600-17753,414
- 1900-19992,999
- 2001-2,647
- 18th century2,643
- 1918-19452,493
- 1783-18652,141
- 2001-20092,084
- 1981-2,044