Catalogues raisonnés present a definitive overview of an artist's body of work; all known works that exist at the time of publication are included. You can use the following sites to find catalogues on a particular artist, and then search the Tufts Classic Catalog to see whether a title is owned by a Tufts library.
Don't let your research stop at libraries, databases, or the internet-- get out and explore these wonderful local institutions.