--subdivision Audio-visual aids under subjects; and subdivision Study and teaching--Audio-visual aids under subjects for the use of audio-visual aids in the learning and teaching of those subjects, e.g. Geography--Study and teaching--Audio-visual aids
Audio Visual Education Equipment And Supplies -- See Also the narrower term Audio-visual equipment Here are entered general works on projectors, screens, sound equipment, pointers, tables, exhibit boards, etc. --names of particular equipment, e.g. Motion picture projectors