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Subject (Era)
- 20th century19,085
- 19th century6,384
- 1945-2,394
- 18th century2,146
- 21st century1,286
- 17th century1,214
- 1989-1,004
- Civil War, 1861-1865864
- 1945-1989842
- 1980-651
- 16th century642
- 2001-631
- Early modern, 1500-1700603
- 1933-1945565
- 1960-550
- 1993-423
- Revolution, 1775-1783415
- 1981-1989389
- Colonial period, ca. 1600-1775351
- 1951-342