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Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
2 results returnedMethods of excavation and roof support used in some recently constructed tunnels
Organizations with programs beneficial to coal-mine employees
Published Year
Subject
- Coal mines and mining--Safety measures (1)
- Mine safety (1)
- Mining engineering (1)
- Tunneling--Equipment and supplies (1)
Author
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