Safety organizations at lake Superior iron mines

Author: Crawford, Frank Stevens,
Year: 1932
Document Type: USBM
Issuing Agency: U.S.Bureau of Mines,
SUDOC: C 22.5:515
Series: Technical paper / United States. Bureau of Mines ;
Report Number: 515.
Subjects: Iron mines and mining--Superior, Lake
Iron mines and mining--Safety measures
Link: https://hdl.handle.net/2027/mdp.39015077559154

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