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Spatial Coverage
- United States7
- Powder River Basin (Wyo. and Mont.)4
- Powder River Basin.4
- San Juan Basin (N.M. and Colo.)2
- San Juan Basin.2
- Alaska1
- Alaska.1
- Atlantic Coast (Middle Atlantic States)1
- Atlantic Coast (New England)1
- Atlantic Coast.1
- Atlantic Ocean1
- Black Canyon of the Gunnison National Monument Region1
- Colorado1
- East Stroudsburg Region1
- Georges Bank1
- Georges Bank.1
- Hawaii1
- Hawaii.1
- Middle Atlantic States1
- Middle West1
