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

Author:	Yant, W. P.
Year:	1935
Document Type:	MAIN
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:6845
Series:	Information circular / Bureau of Mines ;
Report Number:	6845
Subjects:	Breathing apparatus
	Mine safety
Link:	https://hdl.handle.net/2027/mdp.39015095086271