Available in HTML, plain text (us-ascii), Plucker, EPUB, & MOBI formats from Ebook #21647.
Produced from Astounding/Analog, July 1960. The HTML version includes artwork from that issue, credited to van Dongen. It also includes marginal page numbers running 106-136; these have been used in determining pagination in this listing.
The Project Gutenberg wrapper gives the author as E. E. Smith, the transcribed text as Edward E. Smith, Ph.D.
"The original page numbers from the magazine have been retained."
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"There was one instance each of 'hyperspace' and 'hyper-space'. There was one instance of 'hook-up' and one of 'hookups'. These hyphenations were not changed."
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