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Subject (Era)
- 20th century4,643
- 19th century2,421
- 21st century1,366
- 18th century770
- 1900-1999561
- 17th century447
- Civil War, 1861-1865336
- 1800-1870292
- 2000-2099245
- 1800-1899237
- 1939-1945237
- 20th Century224
- Colonial period, ca. 1600-1775214
- Revolution, 1775-1783173
- To 1500140
- 1933-1945138
- 1945-136
- Civil War, 1936-1939126
- 16th century109
- Revolution, 1789-179990