Comparison of Gas Masks, Hose Masks, and Oxygen-Breathing Apparatus

Author:	Katz, S. H.
Year:	1923
Document Type:	N/A
Series:	Report of investigations (United States. Bureau of Mines)
Report Number:	Serial No. 2489
Subjects:	Mine safety.
	Gas masks.
	Breathing apparatus.
Link:	http://digital.library.unt.edu/ark:/67531/metadc100849/