Are there any good books on ambient? I've never read Prendergrasts or any others for that matter.
For techno - I highly recommend Dan Sicko's book. Which... I forget the title of... but I think it's called Techno something. Techno specifically from a Detroit point of view with a few bits on Chicago House - New York, Berlin, etc... It's mostly the Detroit thing though.
Wait, wasn't this about ambient?