Postcard image of the w:Oklahoma Governor's Mansion, circa 1941. Published by now-defunct Mid-Continent News Company, who failed to copyright the image. 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 (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.
Postcard image of the Oklahoma Governor's Mansion, circa 1941. Published by now-defunct Mid-Continent News Company, who failed to copyright the image. Public domain. {{PD-Pre1978}}