The books listed in the right column include color plates of artworks and a good place to start researching.  The call numbers for the books may be used in both the main and folio (large books) stacks.

Portrait artists by period (look in CONSORT for books on these individuals):

20th Century
Diane Arbus
Weegee
Joel Meyerwitz
Ronald Marsh
Berenice Abbott
Robert Frank
Richard Avedon
Cecil Beaton

In additon to the many portraiture books we have in the library, there are a number of books in the reference collection which may be useful.  The reference collection is housed on the 2nd floor of Chalmers, near the Helpline.  If you need assistance locating materials, stop at the reference desk.