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19th century
100
Cretaceous
79
20th century
69
From 65 to 140 million years ago
26
1876
19
1866-1895
18
Paleozoic
17
Proterozoic
17
Precambrian
16
Civil War, 1861-1865
15
Mississippian
15
Permian
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1800-1899
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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
21st century
8
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