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Stench warning tests, Lake Superior district mines
Sinking large-diameter drill holes, Lake Superior district underground iron mines
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Published Year
1940-1949 (2)
Subject
Iron mines and mining--Lake States (1)
Mine safety (1)
Shaft sinking (1)
Author
Johnson, Ernest W. (2) *
Cash, F. E. (1)
Cash, Frank E. (1)
