Here are entered works on all types of media used for the recording of sound including cylinders, analog discs, digital discs, films, tapes, and wires, as well as works about analog discs alone.
--subdivision Audiotape catalogs under names of countries, cities, etc., names of individual persons and corporate bodies, and under ethnic groups, topical headings, and forms and types of musical compositions for lists or catalogs of sound recordings in audiotape format
--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
--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