Author
- Dodge, Clifford H. 2 results
- Faill, Rodger T. 1 results
- Geological Survey of Pennsylvania 4 results
- McCoy, Kaycee L. 1 results
- Miles, F. 1 results
- Pennsylvania. Bureau of Topographic and Geologic Survey 3 results
- Pennsylvania. Department of Conservation and Natural Resources
- Pennsylvania. Department of General Services 1 results
- Pennsylvania. Department of Transportation. Geographic Information Division 1 results
- Schmitt, Zachary 1 results
- Sevon, William D., 1 results
- Shaulis, James R. 1 results