Roof bolting in the United States /
by Edward Thomas.
|Main Author:||Thomas, Edward.|
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1950.
Coal mines and mining
Coal mines and mining /
Coal mines and mining / United States /
Mine roof bolting.
Paper presented at Sixth International Conference of Directors of Mine Research, Paris, France, July 24-28, 1950.
8 p. :
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