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Temporal Coverage
- Civil War, 1861-186522
- Quaternary14
- 19th century13
- French and Indian War, 1754-176310
- From 2 million years ago8
- Revolution, 1775-17838
- 1914-19187
- 1775-17836
- 1861-18656
- Devonian6
- Paleozoic6
- 1800-18995
- 1939-19455
- Cretaceous5
- From 65 to 140 million years ago5
- Precambrian5
- Tertiary5
- 1754 - 17634
- From 230 to 570 million years ago4
- 19th century.3
