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by Hyvarinen, John.
Published: U.S. Dept. of Interior, Bureau of Mines, 1949
Description: 26 pages : illustrations ; 27 cm.
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by Hyvarinen, John.
Published: U.S. Dept. of the Interior, Bureau of Mines, 1949
Description: 18 pages : illustrations ; 26 cm.
Book
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Copper mines and mining Safety measures Mine accidents Strip mining Safety measures