the easiest way I have found is to make a new library, import all the books.
Then run the duplicate check and type not in front of the result in the search bar. (gives you the ones that aren't dups.)
I copy these to the original library and delete them from the new library (I call it dups.)
Then at my leisure I can check for other things like better dups in manageable chunks by copying about 50 to the main library and deleting them from the dups library , running the check duplicates plugin and checking them
Helen
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