Analysis of 494 accidents, open-pit iron-ore mines, beneficiation plants, and shops Lake Superior District

Author:	Pynnonen, R. O.
Additional Authors:	Look, A. D., Zaverl, L. J.
Year:	1959
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7892
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	7892
Subjects:	Mine accidents--United States
	Iron mines and mining--Superior, Lake
Link:	https://hdl.handle.net/2027/mdp.39015078454538