Evolution of methane detecting devices for coal mines

Author:	Ilsley, L. C.
Additional Authors:	Hooker, A. B.
Year:	1933
Document Type:	USBI
Issuing Agency:	U.S. Bureau of Mines,
SUDOC:	I 28.27:6733
Series:	Information Circular / Bureau of Mines ;
Report Number:	6733
Subjects:	Coal mines and mining--Safety measures
	Methane
Link:	https://hdl.handle.net/2027/mdp.39015077572389