Since the magazine was published in the U.S. before 1964, the original copyright lasted 27 years from the end of the year of publication. The copyright holder was free to renew the copyright any time during the year 1977, but they did not do so. Copyright renewals can be searched at this online books listing.
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.
The original description page was here. All following user names refer to en.wikipedia.
2006-04-24 00:41 Pepso 870×1280× (355289 bytes) {{fair use in Other Worlds (magazine)}} Source: Clark Publishing Web source: http://www.fp.ucalgary.ca/unicomm/news/gibson/photos.html
Captions
Magazine cover of Other Worlds November 1949 issue