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Author
Pennsylvania. Bureau of Topographic and Geologic Survey
8
Geological Survey (U.S.)
3
Epstein, Jack Burton, 1935-
3
Williams and Heintz Map Corporation
2
Fullerton, David S.
2
Gray, Carlyle
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2
Kuchinski, John G.
2
Richmond, Gerald Martin, 1914-
1
Berg, Thomas M.
1
Cecil, L. DeWayne
1
Colton, George Willis, 1920-
1
Kreimeyer, Deborah F.
1
Miles, C. E.
1
Milewski, Virginia M.
1
Petty, A. J.
1
Popenoe, Peter
1
Roen, John B.
1
Schweinfurth, Stanley P.
1
Tyson, Natalie S.
1
United States. Bureau of Mines
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13
Pennsylvania
3
Monroe County
2
Northampton County
2
Northeastern States
1
Centre County
1
Clearfield County
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1
Clinton County
1
Harrisburg Region
1
Philadelphia Region
1
Pine Creek Valley (Potter County-Lycoming County)
1
Pittsburgh Region
1
Washington County
1
Waynesburg Region
1
Waynesburg Region (Pa.)
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Year of Publication