Form: Short story
Year: 1956
Publication history:
- 1956 : Fantastic Universe August 1956 (m) ,
- 1958 : New Worlds April 1958 (m) ,
- 1968 : Men and Machines (hc) , Meredith
- 1975 : Sunrise on Mercury (hc) , Thomas Nelson
- 1979 : Le livre d'or de la science-fiction: Robert Silverberg (pb) , Pocket, 448 pp., ISBN 2-266-00597-9, 5032 (in French "Le circuit Macauley")
- 1984 : Machines That Think (hc) , Holt Rinehart Winston
- 1988 : Voir l'invisible (pb) , Pocket, 448 pp., ISBN 2-266-02713-1, 5032 (in French "Le circuit Macauley")
- 1996 : The Road to Nightfall (The Collected Stories of Robert Silverberg Volume 4) (tpb) , HarperCollins UK (UK), 347 pp., ISBN 0-586-21372-4
- 2002 : Le Chemin de la nuit: Nouvelles au fil du temps, tome 1, 1953-1970 (tpb) , Flammarion (France), 727 pp., ISBN 2080682350, 32 (in French "Le circuit Macauley")
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