ONIX codelists Issue 51

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List Code Heading Add Mod ?
27 Subject scheme identifier
Used with <SubjectSchemeIdentifier> <b067>
27 33 ECPA Christian Book Category
ECPA Christian Product Category Book Codes, consisting of up to three x 3-letter blocks, for Super Category, Primary Category and Sub-Category. See http://www.ecpa.org/ECPA/cbacategories.xls

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