Extracting final stump in pillars and pillar lifts with continuous miners

Author:	Stahl, R. Ward.
Year:	1960
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:5631
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	5631
Subjects:	Coal-mining machinery
	Mining engineering
Link:	https://hdl.handle.net/2027/mdp.39015078528356