Testing safety catches on mine cages, Lake Superior district

Author: Pearce, Clyde M.
Additional Authors: Cash, Frank E.
Year: 1945
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7325
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 7325
Subject: Iron mines and mining--Lake States--Equipment and supplies--Safety appliances
Link: https://hdl.handle.net/2027/mdp.39015074127617

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