PUBLICATION HISTORY

  • Analog, June 1966, p. 9-85, by 'Hank Dempsey'. Illustrated by Gray Morrow.

  • Analog 6, edited by John W. Campbell. New York: Doubleday, 1968, hbk.

  • Analog 6, edited by John W. Campbell. New York: Pocket Books, 1969, pbk.