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Collection
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Subject
Author
8
Geological Survey (U.S.)
4
Chester County Water Resources Authority
2
Wettstein, William C.
2
Wood, Charles R.
1
Aichele, Steven S.
1
Barker, James L., 1936-
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1
Bird, Philip H.
1
Bossert, April
1
Delaware River Basin Commission
1
Hippe, Daniel J.
1
McGovern, John E.
1
McManus, B. Craig
1
Pennsylvania. Bureau of Mining and Reclamation
1
Saad, David A.
1
Sams, James I.
1
Schreffler, Curtis L.
1
Sloto, Ronald A.
1
Walker, Jeffrey S.
1
Witt, Emitt C.
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