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- Natural Lands Trust46
- U.S. Geological Survey32
- Natural Lands Trust with input data from PA DEP.15
- USDA-FSA Aerial Photography Field Office7
- Delaware Valley Regional Planning Commission6
- U.S. Geologic Survey; Pennsylvania Bureau of Topographic and Geologic Survey6
- Allegheny County Division of Computer Services Geographic Information Systems Group4
- Lancaster County4
- U.S. Geological Survey Aero-Metric, Inc.4
- U.S. Geological Survey (USGS)3
- Natural Lands Trus2
- Pennsylvania Sea Grant2
- The Pennsylvania State University2
- University of Vermont Spatial Analysis Laboratory2
- EarthData International, LLC1
- Lehigh Valley Planning Commission, U.S. Geological Survey1
- Mifflin County - Laura H. McLaughlin1
- Natural Lands Trust with input data from ERRI and the EROS data center1
- PA DCNR Bureau of Topographic and Geologic Survey1
- Penn State - Office of Physical Plant1