Hard Sciences and Tough Technologies
Clement, Hal. "Hard Sciences and Tough Technologies." In The Craft of Science Fiction. Reginald Bretnor, ed. New York: Harper, 1976.
Cited in David Samuelson, "On Hard Science Fiction: A Bibliography," SFS #60 = 20.2 [July 1993]: 151.)
RDE, Initial Compiler, 21May19