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

Keyword Search

Modified longwall mining with a German coal planer (plow) in the Pocohontas No. 4 coal bed, Helen, W. Va.

Published Year

• 1950-1959 (1)

Subject

• Coal-mining machinery (1) *
• Longwall mining--Equipment and supplies (1)

Author

• Dowd, James J. (1)
• Haley, Wilbur A. (1)
• Turnbull, Louis A. (1) *

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

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