Available in unpaginated HTML, plain text (us-ascii & iso-8859-1), & Plucker formats from Ebook #25061.
Produced from Amazing Stories, September 1957. The HTML edition includes artwork, uncredited but signed Llew, from that issue, as well as a small reproduction of the issue's cover (this was the cover story), which is by Ed Valigursky.
Publisher's wrapper gives the author as "Ivar Jorgensen (AKA Randall Garrett)", but the text itself as "Ivar Jorgensen".
"Produced by Greg Weeks, Stephen Blundell and the Online Distributed Proofreading Team at http://www.pgdp.net".