Antiquarian book values?

Normally, library copies have no special value, precisely because they WERE library-owned and then deaccessioned. The only usual exceptions involve very, very rare books that were in private libraries In those cases, the owner's bookplate and stamps can actually add value.

However rare this book, there will probably be non-library-owned copies that will put it in the shade in terms of value. However, if you think this book is sufficiently rare and important that a library copy might still be valuable (it would have helped if you'd said what it was), then contact the dealer below for an expert opinion. I've used this dealer more than once.