Simon Reynolds books are alright if a bit cliched, tend to focus on dance music as a whole rather than strictly techno though

or this DiY culture: party & protest in ... - Google Books

again not strictly techno but good background on early 90's party and squat scene

growth of minimal in Berlin - Metro Times - Music: Losing your mind in Berlin

http://www.kapstadt.diplo.de/Vertret...erty=Daten.pdf

Techno Rebels: The Renegades of Electronic Funk Painted Turtle Book: Amazon.co.uk: Bill Brewster, Dan Sicko: Books

Lost and Sound: Berlin, Techno und der Easyjetset: Amazon.co.uk: Tobias Rapp: Books