List of devices for respiratory protection approved by the U.S. Bureau of Mines

Author:	Yant, W. P.
Year:	1936
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6918
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	6918
Subjects:	Mine safety
	Breathing apparatus
Link:	https://hdl.handle.net/2027/mdp.39015095086313