Safety standards and safety suggestions at iron mines in the Lake Superior region

Author:	Crawford, Frank Stevens,
Year:	1931
Document Type:	MAIN
Issuing Agency:	U.S. Dept. of Commerce, Bureau of Mines,
SUDOC:	C 22.11:6510
Series:	Information circular / Bureau of Mines ;
Report Number:	6510
Subjects:	Iron mines and mining--Superior, Lake
	Iron mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015095085414