I have an old archive of PDF files, almost 60,000 PDFs that I dip into every now and then (most are not imported into Calibre.) But I also have LIT, AWZ, Mobi, etc -- and I was doing some clean-up and just wanted to spot all the places where I hadn't yet done an ePub conversion. The template I sorted out, combined with a field configured to display checkmarks is doing a good job, and could easily be converted to show me books that do (or don't have) any of the different formats -- which is a nice little bonus.
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