TY  - BOOK
AU  - Helfferich,Friedrich, x
AU  - x
TI  - Ion exchange: x
SN  - x
U1  - 544.923/HEI 
PY  - 1962///
CY  - N.Y.
PB  - McGraw-Hill
KW  - Chemistry, Analytical
N1  - x
ER  -