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Author
- Sanborn Map Company2,081
- Natural Lands Trust49
- Pennsylvania Department of Environmental Protection34
- U.S. Department of Commerce, U.S. Census Bureau, Geography Division33
- Pennsylvania Fish and Boat Commission32
- Allegheny County Division of Computer Services Geographic Information Systems Group31
- Environmental Resources Research Institute29
- Delaware River Basin Commission (DRBC)27
- U.S. Geological Survey24
- Natural Lands Trust with input data from PA DEP.21
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Cartographic Information Division14
- The Pennsylvania State University14
- SRBC12
- Pennsylvania Department of Transportation, Bureau of Planning and Research, Geographic Information Division9
- Pennsylvania Game Commission9
- U.S. Geological Survey in cooperation with U.S. Environmental Protection Agency, USDA Forest Service, and other Federal, State and local partners (see dataset specific metadata under Data_Set_Credit for details).9
- Dr. Toby Carlson, Penn State University8
- Toby Carlson, Penn State University8
- City of Philadelphia7
- Delaware Valley Regional Planning Commission7