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Subject (Era)
- 20th century118
- 19th century84
- 16th century73
- 18th century66
- 17th century39
- Early modern, 1500-170021
- 400-140017
- Revolution, 1775-178316
- Civil War, 1861-186515
- 21st century13
- 1400-160012
- 1945-11
- 1933-19459
- Colonial period, ca. 1600-17758
- To 15008
- 1914-19456
- 1918-19336
- Classical period, 1500-17006
- Medieval6
- Revolution, 1789-17996