Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
3 results returnedSearch results
- Drill dust-collectors and drilling equipment with integral dust-collecting systems approved by the Bureau of Mines as of January 31, 1961
- A study of dust-control methods for continuous mining of coal
- Permissible mine equipment approved by the bureau of mines during 1953-62 :a supplement to Bulletin 543
