Multislice mining for thick western coal seams

Author:	Hackett, T. D.
Additional Authors:	Boreck, D. L., Clarke, D. R.
Year:	1990
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:9239
Series:	Information circular / Bureau of Mines ;
Report Number:	9239
Subject:	Coal mines and mining--West (U.S.)
Link:	https://hdl.handle.net/2027/mdp.39015078458331