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1
by Carrara, Paul E.
[Reston, Va.?] : The Survey, 1997
[Reston, Va.?] : The Survey, 1997
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Government Document
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4
5
by Robson, Stanley G.
Washington : U.S. Govt. Print. Off, 1981
Washington : U.S. Govt. Print. Off, 1981
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Map
6
Oley, PA : Bullfrog Films, 1988
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Map
7
by Cooper, W. E. (Wade Emanuel), 1955-
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1990
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1990
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