Survey of practices in controlling roof at intersections and junctions in underground coal mines

Author:	Stahl, R. Ward.
Year:	1962
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8113
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	8113
Subjects:	Coal mines and mining--Safety measures
	Mine roof control
	Mine roof bolting--Testing
Link:	https://hdl.handle.net/2027/mdp.39015077564261