Frictional ignition with coal mining bits

Author:	Courtney, Welby G.
Year:	1990
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I28.27:9251
Series:	Information circular / Bureau of Mines ;
Report Number:	9251
Subjects:	Methane--Combustion
	Friction
	Coal-cutting bits--Testing
Link:	https://hdl.handle.net/2027/mdp.39015078458430