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Spatial Coverage
- Vermont15
- Powder River Basin (Wyo. and Mont.)12
- New Hampshire10
- Alaska8
- Black Hills (S.D. and Wyo.)8
- Montana8
- United States8
- Windham County8
- Windsor County8
- Long Island Sound (N.Y. and Conn.)7
- Nevada7
- California6
- Connecticut6
- Missouri6
- New Jersey6
- South Dakota6
- Bennington County5
- Michigan5
- Powder River Basin.5
- Wisconsin5