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Institution
Collection
Subject
Author
Geological Survey (U.S.)
10
Bromery, Randolph W. 1926-2013
10
Zandle, Gerald L.
2
Conger, Randall W.
2
Drake, Avery Ala, 1927-
2
Henderson, John R.
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2
Kehn, Thomas M.
2
United States. Environmental Protection Agency
2
Wood, Gordon H. 1919-
1
Cecil, L. DeWayne
1
Epstein, Jack Burton, 1935-
1
Gerhart, James M.
1
Lash, Gary George
1
Lazorchick, George J.
1
Lyttle, Peter T.
1
Millcreek (Lebanon County, Pa. : Township)
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Reif, Andrew G.
1
Sloto, Ronald A.
1
Susquehanna River Basin Commission
1
United States. National Park Service
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Language
Genre
Literary Form
Region
Berks County
Pennsylvania
5
Lancaster County
5
Lehigh County
4
Schuylkill County
3
Lebanon County
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3
Montgomery County
1
Appalachian Region
1
Carbon County
1
Chester County
1
Hopewell Furnace National Historic Site
1
Hopewell Furnace National Historic Site (Pa.)
1
Northampton County
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Year of Publication