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Subject (Era)
- 20th century43,472
- Civil War, 1861-186530,099
- 19th century17,187
- Revolution, 1775-178316,646
- 21st century8,403
- 1945-6,386
- 1861-18655,650
- 1945-19894,680
- 1775-17834,370
- 18th century3,995
- 1989-3,698
- Colonial period, ca. 1600-17753,695
- 1933-19453,561
- War of 18123,527
- 1900-19993,280
- 2001-2,662
- 1918-19452,556
- 1783-18652,142
- 2001-20092,097
- 1981-2,048