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Subject (Era)
- 20th century3,891
- 19th century1,838
- 21st century1,037
- 18th century550
- 1900-1999400
- 17th century249
- Civil War, 1994222
- Revolution, 1789-1799154
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- 16th century140
- 1933-1945139
- 1945-137
- Civil War, 1861-1865135
- 1939-1945122
- To 1500116
- Revolution, 1775-1783108
- 1800-189994
- 1989-89
- 1980-88