Control of roof and prevention of accidents from falls of rock and coal

Author:	Forbes, J. J.
Additional Authors:	Sloman, Harold J.
Year:	1948
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7461
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7461
Subjects:	Coal mines and mining--Safety measures
	Mine roof control
Link:	https://hdl.handle.net/2027/mdp.39015077578584