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2
Geological Survey (U.S.)
2
Geological Survey (U.S.),
1
Langland, Michael J.
1
McElroy, Thomas A.
1
McElroy, Thomas A.,
1
Oley (Pa. : Township)
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1
Paulachok, Gary N.,
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Pennsylvania. Department of Military and Veterans Affairs
1
Williams, Donald R. (Hydrologist)
1
Williams, Donald R.,
1
Wood, Charles R.,
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