Safety education at iron mines of the Lake Superior region

Author: Crawford, Frank Stevens,
Year: 1931
Document Type: USBI
Issuing Agency: U.S. Dept. of Commerce, Bureau of Mines,
SUDOC: I 28.27:6520
Series: Information circular / Bureau of Mines ;
Report Number: 6520
Subjects: Iron mines and mining--Superior, Lake
Iron mines and mining--Safety measures
Link: https://hdl.handle.net/2027/mdp.39015077561804

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