Drilling and blasting, open-cut iron-ore mines, Lake Superior District

Author:	Johnson, John A.
Additional Authors:	Stott, Roy G., Anderson, Floyd G.
Year:	1950
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7552
Series:	Information circular / Bureau of Mines ;
Report Number:	7552.
Subjects:	Iron mines and mining--Michigan
	Iron mines and mining--Wisconsin
	Iron mines and mining--Minnesota
	Strip mining
Link:	https://hdl.handle.net/2027/mdp.39015078464206