File:GalaxyOct50rearcover.jpg
Works copyrighted before 1964 had to have the copyright renewed sometime in the 28th year. If the copyright was not renewed the work is in the public domain. These records are in the online catalog found here: http://www.copyright.gov/records .
A search of the copyright catalog found no evidence that the copyright on the back page was renewed, including a search by magazine title and date, and by the apparent title of the back page, "You'll Never See It In Galaxy!"
The copyright on this page was not renewed and it is in the public domain.