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1by Khalafalla, S. E.“...U.S. Dept. of the Interior, Bureau of Mines,...”
Published 1981
Government Document Book -
2“...U.S. Dept. of the Interior, Bureau of Mines :...”
Government Document Book -
3Published 1985“...U.S. Dept. of the Interior, Bureau of Mines,...”
Government Document Book -
4Published 1948“...U.S. Dept. of the Interior, Bureau of Mines,...”
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