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I seem to recall (it's been a while) that there is a setting in Preferences for automatic checking of duplicates.
I know there's one for "automatic adding" (where you stick the books in a directory and Calibre "slurps" them up). I use the "automatic adding" for this kind of thing - I add a portion of titles, and they're in manageable quantities for a rudimentary (for me) check, before I add the next lot.
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