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1“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Book -
2“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Book -
3by Timko, Robert J.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1986
Government Document Book -
4by Thimons, Edward D.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1979
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Government Document Book -
5by Thimons, Edward D.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1974
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Government Document Book -
6by Thimons, Edward D.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1974
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Government Document Book