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I posted about this recently. As calibre uses the 2 sources mentioned to find meta-data if the titles aren't in those databases then you will have to do manual searches online yourself for the details. I imported 1500 books into calibre during 1 day and tried hundreds without finding meta-data. They were all released by online publishers and apparently (although they have ISBN numbers) the databases don't have them. It's not a failing of the program just that there are no databases accessible with details of EVERY book published. The same might be true of self published books. As an experiment you could do an Amazon search on their web site to see if they sell the book.
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