ECU Libraries Catalog
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Era
- Cretaceous284
- 20th century214
- Tertiary191
- Quaternary177
- 19th century158
- Paleozoic146
- Precambrian143
- Devonian132
- Cenozoic125
- Pleistocene114
- Miocene110
- Eocene106
- Ordovician101
- Mesozoic99
- Pennsylvanian96
- Permian96
- Mississippian88
- 18th century85
- Triassic76
- Jurassic71