Search U.S. government technical reports digitized or harvested by TRAIL.

Keyword Search

Mechanical Mining in Some Bituminous-Coal Mines: Progress Report 6. Extraction of Pillars with Mechanized Equipment

Published Year

• 1950-1959 (1)

Subject

• Bituminous coal industry -- United States. (1)
• Coal-mining machinery. (1) *

Author

• Haley, Wilbur A. (1) *
• Shields, Joseph J. (1)
• Toenges, Albert L. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

Search developed and maintained by the University of Washington Libraries
Copyright 2010