LEADER 01251nkm 2200373 450 001 9910713059103321 005 20200320143733.0 035 $a(CKB)5470000002499611 035 $a(OCoLC)1145409046 035 $a(EXLCZ)995470000002499611 100 $a20200320d2018 ua i 101 0 $aeng 135 $aurbn||||||||| 181 $csti$2rdacontent 182 $cc$2rdamedia 183 $acr$2rdacarrier 200 00$aNIOSH respirator filter classes 210 1$a[Washington, D.C.] :$cCenters for Disease Control and Prevention, National Institute for Occupational Safety and Health,$d[2018] 215 $a1 online resource (1 image) 517 3 $aNational Institute for Occupational Safety and Health respirator filter classes 606 $aFilters and filtration 606 $aBreathing apparatus 606 $aIndustrial hygiene 608 $aInstructional and educational works.$2lcgft 615 0$aFilters and filtration. 615 0$aBreathing apparatus. 615 0$aIndustrial hygiene. 712 02$aNational Institute for Occupational Safety and Health, 801 0$bGPO 801 1$bGPO 906 $aBOOK 912 $a9910713059103321 996 $aNIOSH respirator filter classes$93334132 997 $aUNINA