Geologic factors in predicting coal mine roof-rock stability in the upper Kittanning coalbed, Somerset County, Pa. /
by A.T. Iannacchione ... [et al.].
- [Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, [1981]
- ii, 41 p. : ill., maps ; 27 cm.
- Report of investigations / United States Department of the Interior, Bureau of Mines ; 8575. .
- Report of investigations (United States. Bureau of Mines) ; .
Bibliography: p. 37-40.
81009990
Coal mines and mining--Safety measures.--Pennsylvania--Somerset County
Mine roof control.
Rock mechanics--Pennsylvania--Somerset County.
Geology, Stratigraphic.
TN23 TN295 / .U43 no. 8575
622 s 622/.334
Bibliography: p. 37-40.
81009990
Coal mines and mining--Safety measures.--Pennsylvania--Somerset County
Mine roof control.
Rock mechanics--Pennsylvania--Somerset County.
Geology, Stratigraphic.
TN23 TN295 / .U43 no. 8575
622 s 622/.334