Ventilation at the anthracite collieries of the northern Pennsylvania field

Author:	McElroy, G. E.
Year:	1937
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6965
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6965
Subjects:	Anthracite coal--Pennsylvania
	Mine ventilation
Link:	https://hdl.handle.net/2027/mdp.39015077570136