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Spatial Coverage
- United States[remove]39
- United States.7
- Powder River Basin (Wyo. and Mont.)5
- Powder River Basin.5
- Sierra Nevada (Calif. and Nev.)3
- Sierra Nevada.3
- U.S.3
- California2
- Idaho2
- Snake River Plain (Idaho and Or.)2
- Snake River Plain.2
- Wyoming2
- Yellowstone National Park2
- Yellowstone National Park.2
- Appalachian Basin1
- Appalachian Basin.1
- Appalachian Region1
- Appalachian Region.1
- Arizona1
- Atlantic States1
