Author
- United States Department of Agriculture, National Agricultural7
- Wayne L. Myers, Joseph A. Bishop7
- Pennsylvania Bureau of Topographic and Geologic Survey, Dept. of Conservation and Natural Resources6
- Pennsylvania Dept. of Environmental Protection, Bureau of Mining and Reclamation (BMR)6
- U.S. Department of Commerce6
- City Planning Commission (PCPC) Department - GIS Division5
- Penn State ORSER/ERRI5
- Philadelphia City Planning Commission5
- Southeastern Pennsylvania Transporation Authority (SEPTA)5
- Susquehanna River Basin Commission (SRBC)5
- Western Pennsylvania Conservancy5
- American Forests4
- Heritage Conservancy4
- Allegheny College3
- Appalachian Trail Conference and National Park Service Appalachian Trail Park Office3
- Chesapeake Bay Program3
- Chester County Planning Commission3
- David Homans, Pennsylvania Natural Heritage Program3
- Karen Kwasnowski3
- Keep Pennsylvania Beautiful3