Ventilation of manholes.

Author:	Jones, G. W.
Additional Authors:	Campbell, John,, Miller, W. E.
Year:	1940
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:3496
Series:	Report of investigations / United States. Bureau of Mines ;
Report Number:	3496
Subjects:	Air
	Manholes--Design and construction
	Manholes--Maintenance and repair
	Manholes
Link:	https://hdl.handle.net/2027/mdp.39015086546598