The first edition of the National Audiovisual Center sales catalog (LI 003875) is updated by this supplement. Changes in price and order number as well as deletions from the 1969 edition, are noted in this 1971 version. Purchase and rental information for the sound films and silent filmstrips is provided. The broad subject categories are: agriculture, automotive, aviation, biography, business, education and culture, electricity, electronics, health and medical, human relations, machining, marine, national security, philosophy, safety, physical fitness, science, social science, technical, and woodworking. The following information is provided for each film: title, length, type (black and white or color, sound or silent), order number, price and a brief annotation. Indexes by title and by subject are provided. (SJ)