Available in HTML, plain text (us-ascii), & Plucker formats from Ebook #22467.
Produced from Astounding, December 1955. The HTML version includes illustrations from this issue, credited to Freas & signed with his KF-circle logo, as well as the magazine cover (this was the cover story), with artwork credited (in the magazine) to Freas but not signed that I can see. HTML version also includes page numbers (6-44) corresponding to those in the magazine; these have been used here in determining page count & page numbers for contents.
A list of typographical corrections is given following the text.
"Illustrations have been moved to their appropriate places in the text."
The Project Gutenberg wrapper gives the author as William Fitzgerald Jenkins, the text as Murray Leinster.
"Produced by Greg Weeks, LN Yaddanapudi and the Online Distributed Proofreading Team at http://www.pgdp.net".
