Great book! That's actually the book that got me interested in the recent history of my city, which suffered major changes (most say for the worst) that seem to have been taken up from the book's chapters on mdoernist urban development. (http://en.wikipedia.org/wiki/Ceau%C5%9Fima)
Addendum: I realized on the way home that this comment was rather too content-free for HN. So...
More specifically, I was curious if the book you mention has some narrative or historical details on why the grand Epcot vision fell apart/was stymied.
