Unpaginated HTML ebook. This is also available as plain text (iso-8859-1 & us-ascii), without the illustrations. All available formats may be obtained from Ebook #24054.
Produced from Astounding, August 1959. The HTML version includes reproductions of artwork by Martinez from that issue (and also one of Analog's uncredited end-of-story filler illustrations).
The listings at the top of the edition give the author's name as "Gordon Randall Garrett"; however, the listing within the text gives this as "Randall Garrett".
"Produced by Greg Weeks, Bruce Albrecht, Mary Meehan and the Online Distributed Proofreading Team at http://www.pgdp.net".