Ballantine Del Rey: 1978. Paperback, first edition/first printing. Introduction by Frederik Pohl, Afterward by Williamson, and these stories: The Metal Man (1928); Dead Star Station (1933); Nonstop to Mars (1939); The Crucible of Power (1939); Breakdown (1942); With Folded Hands [Humanoids] (1948); The Equalizer (1947); The Peddler's Nose [Quarantine] (1951); The Happiest Creature [Quarantine] (1953); The Cold Green Eye (1953); Operation: Gravity (1953); Guinevere for Everybody (1955); Jamboree (1969); The Highest Dive (1976).