Search
Search U.S. government technical reports digitized or harvested by TRAIL.
Keyword Search
12 results returnedSearch results
- Anthracite mechanical mining investigations.
- Anthracite mechanical mining investigations.
- Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va.
- Anthracite mechanical mining investigations.
- Anthracite mechanical-mining investigations.
- Mining with a Dosco continuous miner on a longwall face
- Mechanical mining in some bituminous-coal mines.
- Modified longwall mining with a German coal planer.
- Anthracite mechanical-mining investigations :use of yielding steel supports (props) in combination with backfilling for mining thick, flat beds
- Mechanical mining in some bituminous-coal mines.
- Modified longwall mining with German coal planers :summary of operations at five coal mines
- The use of augers in surface mining of bituminous coal