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by Bolmer, R. L. (Robert L.)
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1962
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1962
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by Maloney, Raymond P.
Washington : U.S. Dept. of the Interior, Bureau of Mines, 1973
Washington : U.S. Dept. of the Interior, Bureau of Mines, 1973
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