00853nam0-22003011i-450-99000029142040332120001010000029142FED01000029142(Aleph)000029142FED0100002914220001010d--------km-y0itay50------baitay-------001yyWater Purification for Plant Operators.By George D. Norcom, Kenneth W. Brown.New YorkMcGraw-Hill Book Co.1942X,180 p., ill., tav., 23 cm628Norcom,George D.15639Brown,Kenneth W.ITUNINARICAUNIMARCBK99000029142040332104 090-28CIDINCHDINCHWater Purification for Plant Operators127737UNINAING01