008180000a22002050004500003000900000005001700009110006800026245019500094020001800289264004900307490004000356300000900396041000800405650001800413650005000431650002700481650003600508700003000544700003800574PH-MaWHO20241108112334.0  aJoint ILO/WHO Committee on Occupational Health (1968 : Geneva).  aPermissible levels of occupational exposure to airborne toxic substances : sixth report of the Joint ILO/WHO Committee on Occupational Health [meeting held in Geneva from 4 to 10 June 1968].  a92-4-120415-X  aGeneva : bWorld Health Organization,c1969.  a(WHO technical report series ; 415)  a16p.  aeng  aAir pollution  aOccupational diseasesxPrevention and control  aEnvironmental exposure  aMaximum allowable concentration  aWorld Health Organization  aInternational Labour Organisation