Geologic factors in predicting coal mine roof-rock stability in the upper Kittanning coalbed, Somerset County, Pa. /

Bibliographic Details
Corporate Author:	United States. Bureau of Mines
Other Authors:	Iannacchione, Anthony T.
Format:	Government Document Book
Language:	English
Published:	[Washington, D.C.?] : U.S. Dept. of the Interior, Bureau of Mines, 1981.
Series:	Report of investigations (United States. Bureau of Mines) ; 8575.
Subjects:	Coal mines and mining > Pennsylvania > Somerset County > Safety measures. Ground control (Mining) Rock mechanics. Geology, Stratigraphic.