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I've bought paper books thinking it was one I didn't have to discover that only the cover was different. Some books have less memorable titles.
I also have bought books (in town) identical to ones I have. Maybe I have 3000+ paper books. I keep meaning to catalogue them. I even have a real book lending library program I wrote over 25 years ago. It copes with multiple copies and editions of the same title+author. The ISBN/EAN/UPC barcode, if printed, is only used to help add it. Each item then got a different format code that was merely a unique database serial number. One could now use QR codes so that if the database was lost the title, author, edition & copy could be scanned rather than re-typed. Or you could make a backup!
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