Roof control strategies for underground coal mines /
Roof control strategies for underground coal mines /
by William C. Smith.
- Avondale, Md. : U.S. Dept. of the Interior, Bureau of Mines, 1993.
- 17 p. : ill.
- Information circular ; 9351 .
Mines and mineral resources.
Mine roof bolting.
Mine roof control.
Coal mines and mining.
Mines and mineral resources.
Mine roof bolting.
Mine roof control.
Coal mines and mining.