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Subject (Era)
- 20th century6,590
- 19th century3,848
- 18th century2,220
- 21st century2,086
- 17th century1,711
- 16th century1,460
- 1900-1999709
- 2000-2099497
- To 1500484
- Revolution, 1775-1783476
- Civil War, 1861-1865405
- Colonial period, ca. 1600-1775386
- 1775-1783342
- Early modern, 1500-1700256
- 15th and 16th centuries254
- 1800-1899253
- 15th century211
- 1989-181
- 1945-169
- 1450-1600158