Clay veins :their occurrence, characteristics, and support

Author:	Chase, Frank E.
Additional Authors:	Ulery, J. P.
Year:	1987
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:9060
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	9060
Subjects:	Ground control (Mining)
	Clay veins
	Coal mines and mining--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015078470195