Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
5 results returnedSearch results
- Drillability studies :percussive drilling in the field
- A comparison of borer, ripper, and conventional mining products in Illinois No. 6 seam coal
- Tunneling machine research :development of an experimental full-scale research rock cutting device
- Application of large-hole burn cut in room-and-pillar mining
- Computer program to relate dust generation to drum-type coal mining machines