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Spatial Coverage
- EĢtats-Unis3
- Crook County1
- Greene County1
- Hancock County1
- Hinsdale County (Colo.)1
- Knox County1
- La Plata County (Colo.)1
- Little Cottonwood Creek Region (Utah)1
- Maine1
- Mineral County (Colo.)1
- Niagara River Region (N.Y. and Ont.)1
- Niagara River Region.1
- North America1
- Pennsylvania1
- Pennsylvanie1
- Penobscot Bay1
- Salt Lake County (Utah)1
- Salt Lake County.1
- San Juan County (Colo.)1
- Utah1
