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Subject (Era)
- 20th century2,076
- 19th century742
- 1846-1850432
- To 1846431
- 1850-1950251
- 21st century250
- 1900-1999233
- 1951-153
- Civil War, 1861-1865104
- Tertiary93
- 18th century80
- Miocene65
- Pleistocene62
- Pliocene58
- Cenozoic56
- 2000-209950
- 1900 - 199948
- Quaternary47
- Eocene43
- Cretaceous35