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Subject
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5
Geological Survey (U.S.),
3
Patterson, E. D.
2
Pennsylvania. Bureau of Topographic and Geologic Survey,
2
Van Lieu, J. A.,
1
Berryhill, Henry L., Jr. 1921-2013,
1
Kent, Bion H. 1925-
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1
Kertis, Carla A.
1
Pennsylvania. Bureau of Topographic and Geologic Survey
1
Schweinfurth, Stanley P.,
1
United States. Bureau of Mines
1
Wood, Gordon H. 1919-
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