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Subject (Era)
- 20th century6,483
- 19th century4,012
- 18th century2,294
- 21st century1,827
- 17th century1,797
- 16th century1,512
- 1900-1999672
- To 1500491
- Revolution, 1775-1783478
- Civil War, 1861-1865410
- Colonial period, ca. 1600-1775388
- 1800-1899361
- 1775-1783344
- 2000-2099327
- Early modern, 1500-1700259
- 15th and 16th centuries258
- 15th century214
- 1989-181
- 1945-167
- 1450-1600161