Influence of subjacent gob on longwall development mining in the Upper Kittanning Coalbed of south-central Pennsylvania

Author:	Bauer, Eric R.
Additional Authors:	Chekan, G. J., Sames, Gary P.
Year:	1992
Document Type:	BMRA
Issuing Agency:	Bureau of Mines, U.S. Dept. of the Interior,
SUDOC:	I 28.22:9403
Series:	Report of investigations / Bureau of Mines ;
Report Number:	9403
Subjects:	Longwall mining--Pennsylvania--Ebensburg Region
	Coal mine waste--Pennsylvania--Ebensburg Region
	Ground control (Mining)--Pennsylvania--Ebensburg Region
Links:	https://hdl.handle.net/2027/mdp.39015077558750
	no.9403 1992