The Toxic Substances Control Act (TSCA) of 1976 tasks the Environmental Protection Agency to maintain an inventory of chemical substances (with certain exclusions) that are in United States commerce. The inventory was gathered from reports on substances that were produced or imported in 1975-1978. An updated version of the inventory, from which the data in these tapes were drawn, was published in October 1985. The TSCA Chemical Substance Inventory: Reissued Inventory Plansite Information File lists names and addresses for more than 7000 processors and manufacturers of chemicals. Each segment of the Production File contains data relevant to one submitter, identified by a manufacturer's ID, for one chemical substance, identified by a CAS registry number. The data elements present on the production file are: CAS registry number, production volume, activity, manufacturer's ID and processor activity. This file, with the TSCA production information, preferred name, and synonym files, provides the complete Toxic Substances Control Act inventory.