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19th century
95
Cretaceous
79
20th century
66
From 65 to 140 million years ago
26
1866-1895
18
1876
17
Paleozoic
17
Proterozoic
17
Precambrian
16
Mississippian
15
Permian
15
Civil War, 1861-1865
14
20th Century
10
Cenozoic
10
From 230 to 280 million years ago
10
From 570 million to 5 billion years ago
9
Quaternary
9
Tertiary
9
1900-1999
7
Mesozoic
7
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