I loved this book for I love the city it is written about. I also am fascinated by the concept of the World's Fair or International Expo. I have no recollection of going to one of these, but I DO remember them happening. The Seattle Fair stands out - especially for the landmark Space Needle. But, there have been quite a few great buildings (and attractions) to come out of the World's Fair(s). (Thank you Paris 1889 and New York 1964!)
Since I read this book, I've been casually looking for other books and information about the history of the World's Fair (now called "Expos") and most seem to be of the critical ilk.
Wikipedia has a decent overview and at least links to more information.
Maybe it is a dated idea or a fond memory from childhood (much like Tomorrowland '67) but I find the concept - and how it has changed over time - to be completely fascinating.