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Spatial Coverage
- United States[remove]120
- United States.30
- Alaska9
- Hawaii7
- Powder River Basin (Wyo. and Mont.)6
- Powder River Basin.6
- Alaska.5
- Hawaii.5
- Gulf Coast (U.S.)3
- Gulf Coast.3
- San Juan Basin (N.M. and Colo.)3
- San Juan Basin.3
- Wabash River Valley3
- Wabash River Valley.3
- Arizona2
- Colorado2
- Great Smoky Mountains National Park (N.C. and Tenn.)2
- Great Smoky Mountains National Park.2
- North America2
- U.S.2
