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Subject (Era)
- 20th century5,719
- 19th century3,632
- 18th century2,022
- 21st century1,986
- 17th century1,560
- 16th century1,104
- 1900-1999695
- 2000-2099487
- Revolution, 1775-1783472
- To 1500431
- Civil War, 1861-1865405
- Colonial period, ca. 1600-1775385
- 1800-1899349
- 1775-1783344
- Early modern, 1500-1700208
- 15th century191
- 15th and 16th centuries182
- 1989-179
- To 1775159
- 1600-1775158