Combine two formats of the same ebook
I have two formats of several ebooks. I downloaded the ePub and pdf versions of various O'Reilly books that I've purchased.
When I dragged them both into Calibre, I got two entries for them.
When Calibre CONVERTS an ebook, I get one entry with both formats underneath, eliminating clutter.
Is there a way to obtain this result without converting the ebook myself?
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