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

Keyword Search

Control of roof and prevention of accidents from falls of rock and coal :suggested roof supports for use at faces in conjunction with mechanical loading

Published Year

• 1940-1949 (1) *

Subject

• Coal mines and mining--Safety measures (1) *
• Tunneling--Equipment and supplies (1)

Author

• Hansen, M.V. (1) *
• Perz, Frank. (1)
• Seeling, C.H. (1)
• Thomas, Edward. (1)

• About TRAIL
• FAQ
• Join TRAIL
• Contact Us

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