Falls of roof :the no. 1 killer in bituminous-coal mines

Author:	Forbes, J. J.
Additional Authors:	Back, T. L., Weaver, H. F.
Year:	1951
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7605
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7605
Subjects:	Coal mines and mining--United States--Safety measures
	Bituminous coal industry--United States--Safety measures
	Mine roof control--United States
Link:	https://hdl.handle.net/2027/mdp.39015078456186