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Subject (Era)
- 20th century6,634
- 19th century4,026
- 18th century2,296
- 21st century2,091
- 17th century1,798
- 16th century1,514
- 1900-1999737
- 2000-2099497
- To 1500489
- Revolution, 1775-1783478
- Civil War, 1861-1865411
- Colonial period, ca. 1600-1775389
- 1800-1899361
- 1775-1783344
- Early modern, 1500-1700260
- 15th and 16th centuries258
- 15th century213
- 1989-181
- 1945-170
- 1450-1600161