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MARC21-007: Special playback characteristics of sound recording
Properties Listed by Language
Requires Dolby-A playback equipment.
Used only for master tapes and other tape recordings where clear indication is given that the professional Dolby-A encoding was applied, and that Dolby-A decoding is required. Dolby-A encoding is never used for commercial tape or discs. (Instantaneous tape recordings labelled "Dolby" without other indication are normally Dolby-B, particularly cassette recordings.)
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