Numerous studies indicate that the overhead transparency is an effective means of communicating in the instructional process and is favored by both the instructor and the student because of its flexibility and interest value. This index to overhead transparencies lists over 50,000 main titles and provides information on each about its size and physical description, contents, series title when applicable, audience level, producer and distributor code, and year of release. A first section lists titles by subject, the second alphabetically. There are a subject heading outline and an index to subject headings. (PF)