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].