Volume XXII, Number 6. Published by Street & Smith Publications, Inc., 79 7th Ave., New York, NY. Editor, John W. Campbell, Jr.; cover artist, Hubert Rogers; illustrators, Binder, Brown, Rogers, Orban, Schneeman and Wesso.

Feature serial: 1st of 3 parts. H. Wesso, illustrator. Appeared as a complete novel in 1950 under the same title, reprinted in 1964, 1967, 1969, 1970, 1982, 1985 and 1988. Synopsis on Wikipedia: http://en.wikipedia.org/wiki/Cosmic_Engineers

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.

Novelette. Jack Binder, illustrator

Short story. Charles Schneeman, illustrator. Appeared in the anthologies [i]A Treasury of Science Fiction[/i], edited by Groff Conklin, published in 1948, reprinted in 1951; [i]Gates to Tomorrow[/i], edited Andre Norton and Ernestine Donaldy, published in 1973; [i]A Treasury of Science Fiction[/i], edited by Groff Conklin, published in 1980; [i]The SFWA Grand Masters, Volume 1[/i], edited by Frederik Pohl, published in 1999.

Short story

Short story. H. Wesso, illustrator. Appeared in the anthologies [i]Omnibus of Science Fiction[/i], edited by Groff Conklin, published in 1952, reprinted in 1953, 1980 and 1986; [i]Strange Travels in Science Fiction[/i], edited by Groff Conlin, published in 1953; [i]Tales of Science Fiction[/i], edited by Brian N. Ball, published in 1964, reprinted in 1968.

Short story. Hubert Rogers, illustrator. Appeared in the collected works [i]The Best of Raymond Z. Gallun[/i], published in 1978.

Short story

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