Sinking large-diameter drill holes, Lake Superior district underground iron mines

Author: Johnson, Ernest W.
Additional Authors: Cash, Frank E.
Year: 1946
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7354
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 7354
Subjects: Shaft sinking
Iron mines and mining--Lake States
Link: https://hdl.handle.net/2027/mdp.39015074127963

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