English: Cover of the pulp science fiction magazine Amazing Stories October 1957. This was a special edition devoted to "flying saucers", which had become a national fad following the 1947 sightings of saucer-shaped flying objects by airline pilot Kenneth Arnold and others, inspiring US Air Force investigations such as Project Blue Book.
This 1958 issue of Amazing Stories magazine would have the copyright renewed in 1986. Online page scans of the Catalog of Copyright Entries, published by the US Copyright Office can be found here. [1] Search of the Renewals for Periodicals for 1978 and later show no renewal entries for Amazing Stories. Therefore the copyright was not renewed and it is in the public domain.
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.