Kettlebottoms :their relation to mine roof and support

Author:	Chase, Frank E.
Additional Authors:	Sames, Gary P.
Year:	1983
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:8785
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	8785
Subjects:	Mine roof control
	Kettlebottoms (Mining)
	Coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015078477687