Author
Geological Survey (U.S.)
52
United States. Administration on Aging
8
Conger, Randall W.
7
United States. Bureau of Mines
7
Chester County Water Resources Authority
6
United States. Congress. Senate. Committee on Appropriations. Subcommittee on Departments of Labor, Health and Human Services, Education, and Related Agencies
6
United States. Environmental Protection Agency
6
Pennsylvania. Bureau of Topographic and Geologic Survey
5
United States. National Park Service
5
Northeastern Forest Experiment Station (Radnor, Pa.)
4
Pennsylvania. Bureau of Mining and Reclamation
4
United States. Congress. Senate. Committee on Energy and Natural Resources
4
Forest Products Laboratory (U.S.)
3
Goode, Daniel J.
3
New Hope (Pa.)
3
Schreffler, Curtis L.
3
Sloto, Ronald A.
3
United States. Army. Corps of Engineers
3
United States. Navy Department
3
Wood, Charles R.
3
Allegheny National Forest (Agency : U.S.)
2
Bauer, Eric R.
2
Bilger, Michael D.
2
Brightbill, Robin A.
2
Burton, William C. 1952-
2
Daniels, David L. 1937-
2
Drake, Avery Ala, 1927-
2
Durlin, Randall R.
2
Kostelnik, Kevin M.
2
McGee, E. S.
2
McManus, B. Craig
2
National Risk Management Research Laboratory (U.S.)
2
Pennsylvania. Department of Aging
2
Pennsylvania. Department of Commerce
2
Porter, Gregory J., 1949-
2
Ratcliffe, Nicholas M. 1938-
2
Ritter, Michael A.
2
Saad, David A.
2
Senior, Lisa A.
2
Ulery, J. P.
2
United States. Congress. House. Committee on Natural Resources
2
United States. Congress. House. Committee on Transportation and Infrastructure,
2
United States. Congress. House. Select Committee on Aging. Subcommittee on Health and Long-Term Care
2
United States. Congress. Senate. Committee on Energy and Natural Resources,
2
United States. Department of the Interior. Southwestern Pennsylvania Heritage Preservation Commission
2
United States. Forest Service
2
United States. Office of Surface Mining Reclamation and Enforcement
2
University of Pittsburgh
2
Walters, Russell S.
2
Witt, Emitt C.
2
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