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