thank you eschwartz for your very quick reply. i did as you suggested and it turned up bunches and bunches of problems -- too many for me to not fear deleting something i shouldn't. i wanted to preserve the book addition dates, but think now my best course of action is to just start over--uninstall calibre to wipe out the library completely, then reinstall and add a single copy of all the books.
i got sloppy last fall and stopped maintaining my separate copy of new ebook additions made to calibre. since the calibre database is confused about so many of the books within its library folder, i'm afraid a simple export won't pick up all the books actually in there. sigh. i've got my work cut out for me extracting them to compile a master file to work from.
thanks again for pointing me to a useful tool (which i hope i will never need because i'll be so organized in future).
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