00809nam0-22003011i-450-99000032707040332120001010000032707FED01000032707(Aleph)000032707FED0100003270720001010d--------km-y0itay50------baitay-------001yyIon exchangeBy Friedrich Helfferich.New YorkMcGraw-Hill1962IX,624 p., ill., 24 cmMcGraw-Hill Series in Advanced Chemistry660Helfferich,Friedrich15653ITUNINARICAUNIMARCBK99000032707040332104 141-152ELETTR. 3393DINCHDINCHIon Exchange127724UNINAING01