Some pertinent information about mine gases

Year:	1938
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6983
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6983
Subjects:	Mine gases--Measurement
	Mine gases--Physiological effect
Link:	https://hdl.handle.net/2027/mdp.39015077569997