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bureau of mines technology transfer seminar 1985 pittsburgh
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Mine subsidence control
Bureau of Mines Technology Transfer Seminar (1985 Pittsburgh, Pa.) · U.S. Dept. of the Interior, Bureau of Mines
56 sayfa · 1985
Congresses / Mine subsidences
Earth grounding beds--design and evaluation
Bureau of Mines Technology Transfer Seminar (1985 Pittsburgh, Pa. and Reno, Nev.) · United States Dept. of the Interior
24 sayfa · 1985
Electric currents / Electric equipment / Electricity in mining / Grounding / Mines and mineral resources