Studies of roof movement in coal mines. [No.] 4., Study of subsidence of a highway caused by mining coal beneath / by E.R. Maize, Edward Thomas, and H.P. Greenwald.
|Main Author:||Maize, Earl R.|
|Other Authors:||Thomas, Edward. , Greenwald, H. P.|
[Washington, D.C.] : U.S. Dept. of the Interior, Bureau of Mines, 1941.
Coal mines and mining
11 p. :
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