Ventilation of manholes.

Additional Authors:	Jones, G. W., Miller, W. E., Yant, W. P., Campbell, John.
Year:	1936
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3343
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3343
Subjects:	Mine ventilation
	Manholes
Link:	https://hdl.handle.net/2027/mdp.39015078518605