LREGISTRY The Registry Learning file Database Producer Chemical Abstracts Service (CAS) Description Learning File to REGISTRY 300.79 KB Download: LREGISTRY (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 Images Structure Search Subjects Chemistry