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Version 2.1 Revision 02 or 03 (04 is largely about changes for Japan)
Code Lists Issue 30Issue 31 (ONIX_BookProduct_Codelists_Issue_3031_Changes.pdf)
BISAC Subject Code list 2014 edition and Regional Themes (2015 Edition is expected by early December)
The overview of ONIX for Books at the Editeur website.
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