Yieldable steel arches and yieldable steel ring supports in metal mines

Author:	Eilertsen, Nils A.
Year:	1962
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8056
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	8056
Subjects:	Metal arches
	Mining engineering
Link:	https://hdl.handle.net/2027/mdp.39015078461194