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8
Pennsylvania. Department of Environmental Protection
4
Geological Survey (U.S.)
4
Geological Survey (U.S.),
3
Koerkle, Edward H.,
2
Hall, David W.
2
Hall, David W.,
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2
Koerkle, Edward H.
2
Lietman, Patricia L.
2
Lietman, Patricia L.,
1
Gustafson-Minnich, Linda C.
1
Gustafson-Minnich, Linda C.,
1
Koerkle, Edward J.
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