Carbide insert bit drilling at the Cleveland-Cliffs Iron Co. mines, Ishpeming, Mich.

Author:	Lewis, Walter E.
Year:	1950
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7558
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7558
Subjects:	Iron mines and mining--Michigan
	Drilling and boring machinery
	Carbide cutting tools
Link:	https://hdl.handle.net/2027/mdp.39015078455436