Kettlebottoms : their relation to mine roof and support /
by Frank E. Chase and Gary P. Sames.
- [Avondale, Md.] : U.S. Dept. of the Interior, Bureau of Mines, 1983.
- 12 p. : ill. ; 28 cm.
- Report of investigations ; 8785 .
- Report of investigations (United States. Bureau of Mines) ; 8785. .
Bibliography: p. 12.
83600100
Coal mines and mining--Safety measures. Kettlebottoms (Mining) Mine roof control.