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Author
- Delaware River Basin Commission (DRBC)26
- Pennsylvania Department of Environmental Protection18
- Natural Lands Trust with input data from PA DEP.11
- Dr. Toby Carlson, Penn State University7
- The Pennsylvania State University7
- Natural Lands Trust6
- Pennsylvania Game Commission6
- Allegheny County Division of Computer Services Geographic Information Systems Group4
- Environmental Resources Research Institute3
- Keep Pennsylvania Beautiful3
- U.S. Environmental Protection Agency3
- Chester County Planning Commission2
- Jarlath O'Neil-Dunne, University of Vermont Spatial Analysis Laboratory, Director2
- National Oceanic and Atmospheric Administration (NOAA), National OceanService, Office of Response and Restoration, Hazardous Materials Response2
- Pennsylvania Fish and Boat Commission2
- US Geological Survey (USGS)2
- Allegheny County - Western Pennsylvania Conservancy1
- Allegheny County Planning Division/Allegheny County GIS Department1
- Anelia Milbrandt1
- ChoptankRiverHeritage.org1