Shield mechanics and critical load studies for unsymmetric contact configurations

Author:	Barczak, Thomas M.
Year:	1990
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:9290.
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	9290
Subjects:	Longwall mining
	Mine roof control--Testing
Link:	https://hdl.handle.net/2027/mdp.39015078475533