01347nam 2200397I 450 991070968190332120180627140216.0(CKB)5470000002471414(OCoLC)1037095162(EXLCZ)99547000000247141420180523d1923 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierComparison of gas masks, hose masks, and oxygen breathing apparatus /S.H. Katz and J.J. Bourquin[Washington, D.C.] :Department of the Interior, Bureau of Mines,1923.1 online resource (5 pages)Report of investigations / United States Department of the Interior, Bureau of Mines ;2489"June, 1923."Gas masksRespirators (Medical equipment)Mine accidentsGas masks.Respirators (Medical equipment)Mine accidents.Katz S. H(Sidney Hershberg),1884-1412367Bourquin J. J.United States.Bureau of Mines,GPOGPOBOOK9910709681903321Comparison of gas masks, hose masks, and oxygen breathing apparatus3505658UNINA