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Subject (Era)
- 20th century16,027
- 1900-19998,642
- 19th century7,169
- 21st century3,924
- 1800-18993,048
- 18th century2,722
- Civil War, 1861-18652,373
- 17th century1,857
- 1861-18651,619
- 1900 - 19991,603
- 2000-20991,601
- To 15001,469
- 16th century1,417
- Revolution, 1775-17831,171
- 1700-17991,127
- Revolution, 1789-17991,097
- 1800-19991,095
- Colonial period, ca. 1600-1775988
- 1775-1783769
- 1900-2099747