Protection factors of the airstream helmet

Additional Authors:	Cecala, Andrew B.
Year:	1981
Document Type:	BMRA
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.23:8591
Series:	Report of investigations / Bureau of Mines ;
Report Number:	8591
Subjects:	Mine dusts
	Mine safety--Equipment and supplies
	Helmets
Link:	https://hdl.handle.net/2027/mdp.39015078471623