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Spatial Coverage
- Mackenzie6
- Northwest Territories6
- Alaska5
- Colorado4
- Allegheny River Watershed (Pa. and N.Y.)1
- Ayer Region1
- Bering Sea1
- California1
- Columbia Plateau1
- Connecticut1
- El Paso County1
- Fountain Creek1
- Gilpin County1
- Glacier Bay1
- Hoover Wilderness Area1
- Koyukuk River Valley1
- Lake County1
- Maine1
- Massachusetts1
- Middlesex County1
