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Subject (Era)
- 20th century6,361
- 19th century3,960
- 18th century2,176
- 21st century2,028
- 17th century1,650
- 16th century1,256
- 1900-1999730
- 2000-2099494
- Revolution, 1775-1783477
- To 1500448
- Civil War, 1861-1865410
- Colonial period, ca. 1600-1775389
- 1800-1899362
- 1775-1783343
- Early modern, 1500-1700255
- 15th and 16th centuries242
- 1989-181
- 15th century177
- 1945-169
- 1861-1865160