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As others have suggested, I feel it would be best if you kept dead tree books you have added to calibre in the same library as your e-books. That way, you wouldn't have to search two libraries to see if you have a certain book. You could also make a custom column for Formats to determine if a book is an e-book or not. Empty books will be blank in the format column. Pity there isn't an easy option (if there is one at all) to add a format to an empty book, especially a new one (such as DTB for Dead Tree Book or AUB for Audio Book).
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