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I just made a custom column 'Other Formats'. There I enter 'paper' for physical books, just to remind me that I have one. And 'pdf', 'mobi' or 'lit' -- for formats that I keep off-Calibre but don't want to delete for various reasons. Empty book for paper edition I bother only when it's part of the series. I've quite enough of empty entries for all the novelettes and shorts that are #xx.xx of some series, but bundled in anthology (and I'm not gonna break it up). Or if there is significant difference between ebook and paper, it'd probably qualify for separate entry (like the illustrated edition of Da Vinci Code).
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