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Geological Survey (U.S.)
1
Geological Survey (U.S.),
1
Lietman, Patricia L.
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McCarren, Edward F.
1
Pennsylvania State University. Department of Biology
1
Pennsylvania. Department of Environmental Protection
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Pennsylvania. Department of Environmental Resources
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Stark, Lloyd R.
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Susquehanna River Basin Commission
1
United States. Bureau of Mines
1
United States. Consolidated Farm Service Agency
1
Ward, Janice R.,
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