Cover of the pulp magazine <i>Amazing Stories</i> (September 1927, vol. 2, no. 6).
<bdi><a href="https://en.wikipedia.org/wiki/en:Frank_R._Paul" class="extiw" title="w:en:Frank R. Paul"><span title="American science fiction illustrator">Frank R. Paul</span></a>
</bdi>
<a href="//commons.wikimedia.org/wiki/File:Amazing_Stories_Volume_02_Number_06.pdf" title="File:Amazing Stories Volume 02 Number 06.pdf">File:Amazing Stories Volume 02 Number 06.pdf</a>