Geologic factors in predicting coal mine roof-rock stability in the Upper Kittanning Coalbed, Somerset County, Pa. - Iannacchione, Anthony T. (Bureau of Mines, Washington, D.C. : U.S. Dept. of the Interior, 1981)
Bibliography: p.37-40
Keywords: Coal mines and mining -- Pennsylvania -- Somerset County -- Safety measures; Ground control (Mining); Rock mechanics; Geology, Stratigraphic