The purpose of the Air Pollution Technical Information Center (APTIC) was to provide bibliographic control of the world's technical literature relating to air pollution, in accordance with a delegation from the Office of Science and Technology in January 1964. APTIC screened: 7,000 periodicals; government reports; patents; technical papers; preprints; dissertations; translations; proceedings; etc. Relevant information was selected, abstracted, indexed, and recorded on computer magnetic tape. A monthly abstract bulletin 'Air Pollution Abstracts' and several bibliographies (most available from NTIS) were published from this file. EPA makes the file accessible on an international on-line retrieval network (currently, under terms of an EPA contract, on the Lockheed system).