Bureau of Mines approval system for respiratory protective devices :(revision of I.C. 7600)

Author:	Pearce, S. J.
Year:	1957
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7792
Series:	Information circular / United States. Bureau of Mines ;
Report Number:	7792
Subjects:	Breathing apparatus
	Respirators (Medical equipment)
Link:	https://hdl.handle.net/2027/mdp.39015078459917