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Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
2 results returnedElectric blasting switches, underground mines, Lake Superior district
Safe equipment, guards, and practices, Lake Superior district iron-ore mines
Published Year
Subject
- Iron mines and mining--Lake States--Safety measures (2)
- Mine safety--Lake States (2) *
- Ground control (Mining)--Lake States (1)
Author
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