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Subject (Era)
- 20th century6,224
- 19th century2,603
- 21st century1,449
- 1900-19991,068
- 18th century1,035
- 17th century606
- 1945-556
- 16th century410
- 2000-2099375
- 1800-1899342
- To 1500306
- 1945-1989302
- 1933-1945264
- 1989-259
- Civil War, 1861-1865254
- 1900 - 1999247
- Early modern, 1500-1700223
- Colonial period, ca. 1600-1775164
- 1939-1945159
- Revolution, 1789-1799145