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- Natural Lands Trust46
- Natural Lands Trust with input data from PA DEP.15
- U.S. Geological Survey14
- Allegheny County Division of Computer Services Geographic Information Systems Group7
- Delaware Valley Regional Planning Commission7
- Lancaster County5
- U.S. Geological Survey Aero-Metric, Inc.4
- University of Vermont Spatial Analysis Laboratory4
- The Pennsylvania State University3
- Karen Kwasnowski2
- Natural Lands Trus2
- PA DCNR Bureau of Topographic and Geologic Survey2
- U.S. Geologic Survey; Pennsylvania Bureau of Topographic and Geologic Survey2
- U.S. Geological Survey (USGS)2
- USDA-FSA Aerial Photography Field Office2
- Allegheny Places Design Team1
- American Forests1
- City of Philadelphia University of Vermont Spatial Analysis Laboratory1
- EarthData International, LLC1
- Lehigh Valley Planning Commission, U.S. Geological Survey1