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3
Geological Survey (U.S.)
3
Pennsylvania. Department of Environmental Protection
2
Geological Survey (U.S.),
1
Chichester, Douglas C.
1
Gustafson-Minnich, Linda C.,
1
Hall, David W.,
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1
Koerkle, Edward H.
1
Koerkle, Edward H.,
1
Lietman, Patricia L.,
1
Pennsylvania. Department of Environmental Resources
1
United States. Department of Agriculture
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