If for some reason you no longr want to use Calibre: The libray folder structure is still usable (only the metadata may be lost)
The folder structure is: Libraryname/Authorname/booktitle(index#)/formats,a cover imagefile,metadata backupfile
The index# serves 2 purposes. It allows for more than 1 edition of a title and that was the linkage to the database (what you saw in Calibre)
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