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Spatial Coverage
- Pennsylvania3
- Washington County2
- Alaska1
- Allegheny County1
- Appalachian Mountains1
- Armstrong County1
- Beaver County1
- Butler County1
- Clarion County1
- Greene County1
- Gulf States1
- Middlesex1
- Ontario1
- Pacific Coast (North America)1
- Pacific Coast (U.S. and Canada)1
- Russia (Federation)1
- Shoshone National Forest1
- Shoshone National Forest (Wyo.)1
- Siberia (Russia)1
- United States1
