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Spatial Coverage
- Powder River Basin (Wyo. and Mont.)6
- Missouri5
- New York (State)4
- Bennington County3
- Montana3
- New Jersey3
- Puget Sound Region3
- Vermont3
- Washington (State)3
- Windham County3
- Alaska2
- Appalachian Region2
- Kansas2
- Mississippi River Valley2
- New Madrid Region2
- New York County2
- Queens County2
- Alaska Peninsula1
- Alaska Peninsula.1
- Aleutian Islands1
