538,227 CHROMATOGRAPHIC Chromatographic and electrophoretic techniques. Ed. by Ivor Smith, and J. W. T. Seakins 4 Ed. Chicago 1976 A William Heinemann Medical Publ. Distributed by Year Book Medical Publ., Inc. 8o Vol. 1. Paper and thin Layer Chromatography. s. IX, nlb. 1, 465, il.