This Cumulative Index covers Volumes 20 to 38 of the Solubility Data Series. The first cumulative index, Volume 19, published in 1985, covered the first eighteen volumes of the series. Both indexes have been produced to enable workers to locate data both for the system of interest and closely related systems without the necessity of consulting the indexes of individual volumes. The index consists of three a System Index, an Author Index and a Chemical Contracts Registry Number Index.