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Subject (Era)
- 20th century12,643
- 19th century4,859
- 18th century3,158
- 21st century2,289
- 17th century1,628
- 1900-1999641
- To 1500516
- 16th century457
- To 221 B.C.441
- Middle Ages, 600-1500401
- 2000-2099256
- 1989-228
- 221 B.C.-960 A.D.212
- 960-1644209
- Early church, ca. 30-600183
- 1950-177
- 1945-162
- 1800-1899145
- Revolution, 1789-1799142
- 1900 - 1999133