The Toxic Substance Act Chemical Substances Inventory: Reissued Inventory lists names and more than 50,000 Chemical Substances. The computer-readable TSCA Chemical Substance Inventory - 1985 Edition and its subsequent computer-readable supplements or cumulative reissues contain chemical substance information for those substances on the non-confidential substance identity portion of the TSCA Master Inventory File. For a complete understanding of the data contained on these tapes, it is necessary to consult the introductory material of the printed 1985 Edition. The revised inventory consists of two files: (1) Inventory preferred name file (EPA-560/7-86-003C); (2) Inventory synonym name file (EPA-560/7-86-003D). This is the first file which contains each substance with its CAS Registry Number, preferred CA Index Name, molecular formula, and other apropriate information. The entries are in ascending CAS Registry Number order. The workunits in the file are in ascending order by CAS Registry Number. Each workunit of substance data can contain the following data elements: Molecular Formula, CAS Registry Number, Sequence Number, Preferred CA Index Name, Name Codes, Replaced Registry Numbers, UVCB Flag, Chemical Substances Definition and EPA Flags. The file with the TSCA Plantside Information, Production Information, and Synonym files, provides the complete Toxic Substances Control Act Inventory.