Conduct a search in the library catalog to find books at the Alumni Library and the other Fenway Libraries (all Wentworth Community members have borrowing privileges at all FLO libraries).
The Boston Public Library offers a larger selection of books and it's right in Copley Square. Some of their books are for in-library use only. Bring coins if you want to photocopy or a digital camera. Check the hours of operation before you head there.
Search ARTstor, a robust image databases, for high quality images, and the Avery Index or Art Full Text for articles about the building.