Revised guidelines are provided for audiovisual materials and services in public libraries serving a population of 150,000 or more. A glossary of terms is followed by definitions of responsibility at the federal, state, regional, and local levels. Allocation of 10 to 15 percent of the materials budget for audiovisual resources is recommended. Other recommendations cover circulation policies, public access, materials selection and handling, and copying. Minimum standards are stated for purchasing specific kinds of materials and staffing the collections. Personnel needs are outlined for state and regional audiovisual collections. Twelve recommendations are made concerning minimum space and equipment, with specific equipment itemized. Finally, standards for maintaining statistical data are given. A form for listing holdings data is appended. (LS)