This is the web site for a graffiti exhibit in Chicago from 1984. As you can imagine, there are some very cool pieces (I really like the PHAZE2 and The RAMM:ELL:ZEE)
“American graffiti art now enjoys considerable acclaim in Europe, where it is widely exhibited and has begun to enter major public collections. Only recently has critical attention come to focus on this work here in America, and a larger public dialogue is still lacking in this country. This exhibition is intended to commence such a dialogue. The exhibition will be the first by an American institution to attempt a qualitative survey which will also include the working drawings for the graffiti works. This exhibition is curated by Richard Flood.”
The Renaissance Society at the University of Chicago: Rapid Enamel, The Art of Graffiti