Quote:
Originally Posted by ownedbycats
A few public domain books I maintain two book records; one for a physical copy, and the other for Standard Ebooks/Project Gutenberg copy.
What would be the best way to denote in the book record that this book has a duplicate? I was thinking of putting something like duplicate:[####] in my administrative tags column, where #### is the ID of the other edition. But other ideas are welcome.

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You can consider your physical books as a "format". Prepare an empty txt file, change the extension to .paperback or .hardback or whatever you like, then add that to your existing ebook.
I have all my physical books catalogued in Calibre this way, and it works just fine.
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