ECU Libraries Catalog
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Era
- Cretaceous284
- 20th century213
- Tertiary190
- Quaternary176
- 19th century157
- Paleozoic146
- Precambrian143
- Devonian132
- Cenozoic125
- Pleistocene113
- Miocene109
- Eocene106
- Ordovician101
- Mesozoic99
- Pennsylvanian96
- Permian96
- Mississippian87
- 18th century85
- Triassic76
- Jurassic71