Culled from the most imaginative and provocative minds of the pas thirty years, these pieces demonstrate the vitality and diversity, the excitement and commitment of the writers who helped make science fiction what it is today.
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Used availability for Damon Knight's Turning Points
February 1977 : USA Hardback
May 2014 : UK Kindle edition
Title: Turning Points: Essays on the Art of Science Fiction
Author(s): Damon Knight
Availability: Amazon UK