Reducing hazards in underground coal mines through the recognition and delineation of coalbed discontinuities caused by ancient channel processes /

Bibliographic Details
Main Author:	Kertis, Carla A.
Corporate Author:	United States. Bureau of Mines
Format:	Government Document Book
Language:	English
Published:	[Pittsburgh, Pa.] : U.S. Dept. of the Interior, Bureau of Mines, 1985.
Series:	Report of investigations (United States. Bureau of Mines) ; 8987.
Subjects:	Coal > Geology > Pennsylvania > Indiana County. Coal > Geology > Pennsylvania > Armstrong County. River channels. Coal mines and mining > Pennsylvania > Indiana County > Safety measures. Coal mines and mining > Pennsylvania > Armstrong County > Safety measures.