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1
由 Stachura, Virgil J.
Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1986
Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1986
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3
由 Deurbrouck, A. W.
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1965
[Washington, D.C.] : U.S. Department of the Interior, Bureau of Mines, 1965
Government Document
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