I don't know where to start off on this, especially since this topic has quickly morphed into a "group-think" sort of deal, but here's my effort:
The Science Fiction Book: An illustrated history, by Franz Rottensteiner
...as well as what I've found to be a superb interview (if a bit long) with Rottensteiner on the subject of many things,
including his works, the genre in which it encompasses, and the future aims of "worldwide fantasy". Interview
found here.