TY  - GEN
AU  - Welcher, Frank J
TI  - Standard methods of chemical analysis: V.2 Industrial and natural products & noninstrumental methods Part  A
U1  - 543 STA.02 
CY  - Newjerssey, D Van nostrand Company Inc
KW  - Chemical analysis / Cation / Anion / Mechanical seperation
ER  -