This is Not a Photo Opportunity [PDF ebook] 
The Street Art of Banksy

This Is Not a Photo Opportunity is a street-level, full-colour showcase of some of Banksy’s most innovative pieces ever. Banksy, Britain’s now-legendary guerilla’ street artist, has painted the walls, streets and bridges of towns and cities throughout the world. Once viewed as vandalism, Banksy’s work is now venerated, collected and preserved. Over the course of a decade, Martin Bull has documented dozens of the most important and impressive works by the legendary political artist, most of which are no longer in existence.’