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Subject (Era)
- 20th century15,599
- 19th century5,991
- 21st century4,769
- 18th century2,238
- 1945-1,870
- 17th century1,497
- 1900-1999975
- 1989-850
- Civil War, 1861-1865847
- 1933-1945728
- 2000-2099658
- Revolution, 1775-1783611
- Colonial period, ca. 1600-1775591
- 1868-572
- 16th century532
- 1918-1945526
- To 1500524
- 1991-470
- 1945-1989467
- 1960-445