ONIX codelists Issue 50

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List Code Heading Add Mod ?
23 Extent type
Used with <ExtentType> <b218>
23 14 Duration of main content
Duration in time, expressed in the specified extent units, of the main content. This is the ‘running time’ equivalent of code 00, and excludes time represented by announcements, titles, introduction or other prefatory material or ‘back matter’

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