This supplement to the 1978 reference guide from the National Audiovisual Center (NAC) lists approximately 600 titles recently added to its collection of more than 12,000 titles. Major subject concentrations of the collection are in education, science, social studies, industrial/technical training, and the environmental sciences; formats include motion pictures, videotapes, slide sets, audiotapes, and multimedia kits. Information provided in the title section includes the title, a physical description of the item (format, time, color or black and white), the producer and number assigned by the producing agency, the distributor (if other than the producer), the NAC order number, availability (sale, rental, loan), a brief description of the content, additional notes, and clearance for use. Also provided are an outline of the subject headings used; a subject index; a list of sponsor/producer codes; explanations of NAC's purchase, rental, and loan policies; and a price list. (MER)