Online: 100 pages of Trespass: A History of Uncommissioned Urban Art

http://www.taschen.com/lookinside/05719/index.htm

Taschen has posted a page-flipping version of their book "Trespass"

You can zoom in to read some pages to see the written bits.

Always happy to have the history or public art further investigated, please enjoy the text as well as the photos :)