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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.
Uploaded a work by Unknown from [https://catalog.archives.gov/id/71988589 NRHP nomination], expressed as a simple derivative of an image in the 1961 Dispatch article; no copyright notice in the newspaper issue. with UploadWizard