000			00355nam a2200133Ia 4500
008			140208s9999 xx 000 0 und d
044			_aU.S.A.
080			_a541.372 H367I
100			_aHelfferich, Friedrich
245			_aIon exchange _cFriedrich Helfferich
260			_bMcGraw-Hill Book _aNew York _c1962
300			_aix, 624 p.; 22cm.
942			_2udc _cGB
999			_c2729 _d2729