Ventilation of manholes.

Additional Authors:	Jones, G. W., Campbell, John., Miller, W. E., Yant, W. P.
Year:	1936
Document Type:	BMRA
Issuing Agency:	United States Bureau of Mines,
SUDOC:	I 28.23:3307
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3307
Subjects:	Manholes
	Mine ventilation
Link:	https://hdl.handle.net/2027/mdp.39015078537134