Roof rock structures and related roof support problems in the Pittsburgh coalbeds of southwestern Pennsylvania

Author:	Moebs, Noel N.
Year:	1977
Document Type:	BMRA
Issuing Agency:	Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:8230
Series:	Report of investigations / Bureau of Mines ;
Report Number:	8230
Subjects:	Mine roof bolting
	Mine timbering
	Coal--Geology--Pennsylvania--Pittsburgh coalbed
Link:	https://hdl.handle.net/2027/mdp.39015078482349