Studies of roof movement in coal mines.
Gibson Mine of the Hillman Coal & Coke Co. /
by E.R. Maize, Edward Thomas, and H.P. Greenwald.
|Main Author:||Maize, Earl R.|
|Related Names:||Greenwald, H. P. b. 1893., Thomas, Edward.|
Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1940.
Mine roof control.
Coal mines and mining.
"Third in series of reports on convergence of roof and floor in coal mines and resultant subsidence of surface."
9 p. :
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