adding a related question to the thread - I have ~200 books in calibre library that were bought from amazon, imported via K for PC & converted to epubs, then original formats deleted. So it's no longer obvious where they came from. Any sliick way to get all those tagged. as amazon books ? I can re-download everything into K for PC again quite easily I think, & then run add books from folder...but I'd need it set to merge with matching titles & not to create new records... then I could add a bulk tag & then delete the mobi versions. is that workable. ?
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