Very interesting. Without that context, I might have assumed it was SF that met the imagined criteria of the heartland: SF that was clearly not transgressive in any sense.
One of the works the author places in the unambiguous, never-questioned core of science fiction is Fahrenheit 451, a book that I'm pretty sure I've heard described as not really science fiction (it may have been by the "it's not crap" criterion).
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http://books.google.com/books?id=a9avHule5XwC&pg=PA49&lpg=PA49&dq=heartland+science+fiction&source=bl&ots=2KHo0PM8n8&sig=B3NYW3sfemQXGBwXaBjgx6eVNIo&hl=en&sa=X&ei=ToV-UYfWHuaE2wX3t4CgDQ&ved=0CG4Q6AEwCA#v=onepage&q=heartland%20science%20fiction&f=false
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