Available in HTML & other formats from Ebook #25567.
Produced from Amazing Science Fiction Stories, January 1960. HTML version includes illustrations from this issue, credited to Grayam, as well as hidden marginal page numbers running 6-23, apparently generally corresponding to the magazine's page numbers; these are used here for pagination. Also included is a list of typographical corrections.
The first illustration is immediately before the first (hidden) page number, & appears to be simply a reduced version of the second illustration.
The publisher wrapper gives the author as Irving E. Cox, the text itself as Irving E. Cox, Jr.
"Produced by Greg Weeks, Andrew Wainwright and the Online Distributed Proofreading Team at http://www.pgdp.net".