005710000a22001570004500003000900000005001700009110006700026245012700093020001800220264004900238490003700287300001000324041000800334650003100342650004000373PH-MaWHO20241108112133.0 aEuropean Seminar for Sanitary engineers (3rd : 1952 : London). aDesign and operation of septic tanks : proceedings [of the] Seminar held in London, england, 27 October - 1 November 1952. a92-4-140018-8 aGeneva : bWorld Health Organization,c1953. a(WHO monograph series ; no. 18). a122p. aeng aSewagezEuropexCongresses aRefuse disposalzEuropexCongresses