Ventilation of manholes.

Author:	Jones, G. W.
Additional Authors:	Baker, E. S., Campbell, John,
Year:	1938
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3412
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	3412
Subjects:	Air
	Ventilation
	Manholes
Link:	https://hdl.handle.net/2027/mdp.39015086556019