Duke's Rare Book, Manuscript and Special Collections Library has untold unique resources. Because of the nature of its collections, its riches are not as discernable through the Duke catalog as other material. In addition to doing a search limited to Rubenstein Library, email or query a special collections librarian for a consult on what may be of interest. RUBENSTEIN SEARCH
Why Bother with Library Research? introductory Youtube video
Keep in mind that specialized Dictionaries can answer many simple art questions.
Dictionary of Subjects and Symbols in Art by Hall, James. (Boulder : Westview Press, c2008.)Lilly Library Ready Reference N7560.H34 2008
Period Dictionaries - Classical
The Grove encyclopedia of classical art & architecture [electronic resource and book]
Grove encyclopedia of decorative arts [electronic resource and book]