ECU Libraries Catalog
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Region
- United States27
- Colorado22
- Wyoming11
- Piceance Creek Basin9
- Utah8
- Green River Formation7
- Alaska2
- Appalachian Basin2
- Bighorn Basin (Mont. and Wyo.)2
- Green River Watershed (Wyo.-Utah)2
- Uinta Basin (Utah and Colo.)2
- West (U.S.)2
- Arctic National Wildlife Refuge1
- Bakken Formation1
- East (U.S.)1
- Estonia1
- Great Britain1
- Illinois1
- Illinois Basin1
- Jordan1