Cementation of bituminous-coal-mine roof strata. Part 1, determining penetrability of mine roof by injecting oil and water / by Earl R. Maize and Joseph J. Wallace.
|Main Author:||Maize, Earl R.|
|Other Authors:||Wallace, Joseph J.|
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1956.
Coal mines and mining.
Mine roof control.
17 p. :
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