The use of dust respirators in coal mines

Author:	Pearce, S. J.
Year:	1950
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7561
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7561
Subjects:	Coal mines and mining
	Breathing apparatus
	Respirators (Medical equipment)
Link:	https://hdl.handle.net/2027/mdp.39015078455576