Reduction in frictional ignition due to conical coal-cutting bits

Author:	Cheng, Lung.
Additional Authors:	Courtney, Welby G., Furno, A. L.
Year:	1987
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I. 28.23:9134
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	9134
Subjects:	Mine fires--Prevention and control
	Coal-cutting bits--Testing
Link:	https://hdl.handle.net/2027/mdp.39015078479543