ONIX codelists Issue 51

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24 Extent unit
Used with <ExtentUnit> <b220>
24 12 Discs
Of an audiobook on multiple Red Book audio CDs. Conventionally, each disc is 60–70 minutes of running time, and disc counts are misleading and inappropriate if the average disc duration is significantly more or less than this (for example if the discs are Yellow Book CDs containing mp3 files). Note that disc breaks are not necessarily aligned with structural breaks in the text (eg chapter breaks). For use in ONIX 3.0 only

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