Mine-accident prevention at Lake Superior iron mines

Author:	Woodbridge, Dwight E.
Year:	1913
Document Type:	USBM
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.7:30
Series:	Technical paper / United States Department of the Interior, Bureau of Mines ;
Report Number:	30
Subjects:	Iron mines and mining--Superior, Lake--Safety measures
	Mine safety--Superior, Lake
Link:	https://hdl.handle.net/2027/mdp.39015077560327