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MARC21-007: Medium for sound of motion pictures
Sound to accompany an item is included as part of a videodisc.
Videodiscs are not ordinarily used to record only sound. A distinction must be made between videodiscs (e.g., 12 in. laser-scan videodiscs that include video information) and compact discs that are used to record sound only (e.g., 4 3/4 in. audio compact discs). The technology to physically record video or audio information on digital disc systems is the same.
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