Control of methane by ventilation of shafts during raise drilling

Author:	Maksimovic, S. D.
Year:	1981
Document Type:	USBI
Issuing Agency:	United States Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8847
Series:	Information circular / Bureau of Mines ;
Report Number:	8847
Subjects:	Coal mines and mining--Safety measures
	Mine ventilation
	Methane
	Raise drilling--Safety measures
Link:	https://hdl.handle.net/2027/mdp.39015078457341