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Subject (Era)
- 20th century3,057
- 19th century1,456
- 21st century1,084
- 1900-19991,001
- 1939-1945547
- 1800-1899383
- 1961-1975272
- 17th century251
- 2000-2099240
- Civil War, 1861-1865225
- 18th century212
- 2003-2011159
- 1929153
- 1933-1945141
- 2001136
- 2011-2020135
- 2009-127
- Revolution, 1775-1783110
- 2001-2010107
- 1861-1865104