Reinventing Art: Robert Rauschenberg -- #3
These are 4 places to start searching for Art History and Art movements through the late part of the 20th century.
20th Century Art
The Brain Bank is an Art history site
This is a Google Search. Google offers a greate resource for Art history sites. I would also try Yahoo (www.yahoo.com) and Webcrawler (www.webcrawler.com).