Geological features that contribute to ground control problems in underground coal mines /
by Valois R. Shea-Albin.
- Avondale, Md. : U.S. Dept. of the Interior, Bureau of Mines, 1993.
- 38 p.
- Information circular ; 9370 .
- Information circular (United States. Bureau of Mines) ; 9370 .
Mines and mineral resources.
Ground control (Mining).
Coal--Geology
Mines and mineral resources.
Ground control (Mining).
Coal--Geology