000 00250nam a2200097Ia 4500
008 190428s9999||||xx |||||||||||||| ||und||
100 _aHelfferich, F.
_913882
245 _aIon exchange
250 _b1962. ix-624
260 _bMcGraw-Hill. New York, U.S.A.
999 _c13707
_d13707