PUBLICATION HISTORY

  • Analog, April 1970, p.121-149, by 'Hank Dempsey'. Illustrated by Vincent di Fate.

  • One Step From Earth, 1970.

  • in: Vertrek van Aankomst [One Step from Earth] [Flemish].

  • as: "Wächter des Lebens" in Stationen im All [One Step from Earth]. 1972. Translated by Walter Ernsting and Rosemarie Ott. [German].

  • The Best SF Stories. London: Hamlyn, 1977, hbk.

  • as: "Défenseurs de la Vie" in Le Livre d'Or de la Science Fiction: Harry Harrison, edited by George W. Barlow. Paris: Presses Pocket, 1985, pbk. p.141-179. Translated by George W. Barlow. [French].