LCA The CA Learning file Database Producer Chemical Abstracts Service (CAS) Description Learning File to CA 399.96 KB Download: LCA (PDF) Database Summary Sheet: Concise description with all fields, all formats, many examples. 699.11 KB Download: Usage terms (PDF) In addition to the STN General Terms & Conditions, please find the file-specific Usage Terms here. Cluster Learning Features CAS RN FSORT Images Select Citation Subjects Life Sciences, Pharmacology & Medicine Chemistry Patents