Quote:
Originally Posted by Cynosarges
Is there any way in Calibre to preserve the hyphens in the ISBN in the Ids field?
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To identify the publisher in an ISBN you must have a list of publisher prefixes. So long as you have the publisher prefix, you don't need the hyphens. Just match as many character as are in each specific publisher prefix.
Note that some big publishers have multiple prefixes, and some publishers will not be consistent in matching prefix to imprint.