HTML ebook, illustrations by Schoenherr from the original Analog, February 1962 publication, with unnoted minor corrections. Also available as plain text (us-ascii) (minus illustrations). All versions are available for reading or download from Ebook #26109.
"Produced by Greg Weeks, Dave Lovelace, Stephen Blundell and the Online Distributed Proofreading Team at http://www.pgdp.net".
The publisher's info gives the author as Gordon Randall Garrett, the text itself as Sam and Janet Argo.
The publisher's info gives the illustrator as John Schoenherr, the text itself (with the second illustration) as Schoenherr.