00797nam0-22002891i-450-99000027711040332120001010000027711FED01000027711(Aleph)000027711FED0100002771120001010d--------km-y0itay50------baitay-------001yyPractical guide to respirator usage in industryBy Gyan Rajhans, David S.L. Blackwell.BostonButterworthscopyr. 1985XIII,161 p., ill., 25 cm602Rajhans,Gyan S.Blackwell,David S.l.ITUNINARICAUNIMARCBK99000027711040332104 004-180IRC 1611/LDINCHDINCHUNINAING01