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Institution
Collection
Format
Subject
Author
Geological Survey (U.S.)
16
Wood, Gordon H. 1919-
9
Drake, Avery Ala, 1927-
8
Epstein, Jack Burton, 1935-
7
Pennsylvania. Bureau of Topographic and Geologic Survey
6
Arndt, Harold H.
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5
Kent, Bion H. 1925-
5
Trexler, J. Peter, 1926-
4
Roen, John B.
3
Lyttle, Peter T.
2
Berryhill, Henry L., Jr. 1921-2013
2
Danilchik, Walter
2
Kehn, Thomas M.
2
Lash, Gary George
2
Minard, James P.
2
Owens, James Patrick, 1924-
2
Schweinfurth, Stanley P.
1
Aaron, John M., 1936-
1
Alvord, Donald C. 1922-
1
Appalachian Regional Commission
1
Arndt, Harold A.
1
Briggs, Reginald P., 1929-2009
1
Bromery, Randolph W. 1926-2013
1
Davis, Robert E.
1
De Witt, Wallace, Jr., 1920-2012
1
Epstein, Anita G., 1937-
1
Gardener, Julia
1
Glaeser, J. Douglas
1
Griscom, Andrew
1
Jennings, D. S. 1885-
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Language
Literary Form
Region
Pennsylvania
16
Schuylkill County
8
Northumberland County
7
Lehigh County
7
New Jersey
7
Northampton County
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7
Washington County
6
Berks County
5
Carbon County
4
Greene County
4
Monroe County
3
Bucks County
3
Columbia County
3
Dauphin County
3
Lebanon County
2
Allegheny County
2
New York (State)
2
Warren County
1
Allegheny County (Pa.)
1
Appalachian Region
1
Hunterdon County
1
Midway Quadrangle (Pa.)
1
Pike County
1
San Juan Basin (N.M. and Colo.)
1
Washington County (Pa.)
1
Waynesburg Region
1
Waynesburg Region (Pa.)
1
Westmoreland County
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Year of Publication