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Subject (Era)
- 20th century4,096
- 19th century3,937
- 18th century1,570
- 21st century1,492
- 17th century1,243
- To 15001,094
- 16th century647
- Civil War, 1861-1865469
- Revolution, 1789-1799418
- 1861-1865393
- Colonial period, ca. 1600-1775368
- 1945-367
- 1933-1945348
- 1989-346
- Civil War, 1642-1649343
- 1775-1865313
- Revolution, 1775-1783270
- Commonwealth and Protectorate, 1649-1660244
- 1991-243
- 1900-1999233