Serial: part 2 of 3 parts. Illustrations by Rogers. Part of the Humanoids Series. Published as part of the novels [i]The Humanoids[/i] (1949) and [i]Wings 4[/i] (1952). Appeared in the collected works [i]With Folded Hands ... And Searching Mind[/i] (2010). Appeared in the magazine [i]Two Complete Science-Adventure Books, Spring 1952[/i], Malcolm Reiss, ed. (1952 April).

Volume XLII, Number 6. Published by Street & Smith Publications, Inc., 775 Lidgerwood Ave., Elizabeth, NJ. Editor, John W. Campbell, Jr.; cover artist, Hubert Rogers; illustrtors, Cartier, Orban and Timmins.

Short story. Illustrations by M. Isip. Appeared in the collected works [i]With Folded Hands ... And Searching Mind[/i] (2010).

Novelette. H. Wesso, illustrator Appeared in the collected works [i]The Best of Jack Williamson[/i], published in 1978, reissued in 1984; and [i]The Crucible of Power[/i], published in 2006. Appeared in the anthology [i]Five Science Fiction Novels[/i], edited by Martin Greenberg, published in 1952.

Short story. Illustrations by Schneeman.

Serial (part 3 of 3). Illustrations by Orban. Part of the Legion of Space Series. Published as a novel in 1939 under the same title.

Two-part novel: part 2 of 2. Illustrations by H. Wesso.

Two-part novel (part 1). Illustrations by H. Wesso. Appeared in the collected works [i]The Blue Spot and Entropy Reversed[/i], published in 2000.

Article.. Appeared in the collected works [i]With Folded Hands ... and Searching Mind[/i] (2010).

Serial: part 1 of 3 parts. Illustrations by Orban Will Stewart: Pen-name used by Jack Williamson. Part of the Seetee Series. Published as a novel in 1950 under same title.