This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionMastersOfSleep.jpg
Cover of October, 1950 edition of Fantastic Adventures featuring "Masters of Sleep" by L. Ron Hubbard. Artist is Robert Gibson Jones. Copyright was either Jones, or more likely Ziff-Davis, who published the magazine.
English: Since this magazine was first published in the U.S. before 1964, the original copyright lasted 27 years from the end of the year of first publication. The copyright holder was free to renew the copyright any time during the year 1978, but they did not do so. (All copyright renewals after 1977 can be searched online here.) The copyright has expired.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.