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Subject (Era)
- 20th century5,271
- Civil War, 1861-18653,983
- 1945-1,987
- Revolution, 1775-17831,850
- 19th century1,712
- 1933-19451,032
- 1918-1945955
- 1945-1989879
- 21st century569
- Colonial period, ca. 1600-1775530
- 1861-1865486
- 1989-452
- 1960-1980389
- 2001-373
- 1981-1989359
- War of 1812310
- 1775-1783305
- 1981-303
- 18th century294
- 1783-1865279