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Hmmm... I would copy all the books from separate libraries to one temporary library and then compare them there. Possibly I would tag them before copying (like, books from the library "old kindle" get the tag "old kindle"). So I can tell which library they originally were from. Copying via Calibre GUI retains all the metadata.
Of course this solution might not suit you.
Last edited by Sirtel; 10-23-2017 at 05:15 PM.
Reason: I meant copying using Calibre GUI, not the file explorer
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