New York: Harper & Row, (1971) dj. Hardcover first edition - A study of the primary major approaches to science fiction, from Verne and Wells (who added a strong social conscience, that has continued in science fiction) to Asimov and Vonnegut. Among the other authors whose works he discusses are Michael Crichton, Nabokov, Bradbury, Andre Norton, Harlan Ellison, Tolkien, Robert Silverberg and many others. Index. 122 pp.