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 Photographer unknown from Toepel, M. G.; Kuehn, Hazel L., Editor The Wisconsin Blue Book, 1956 State of Wisconsin, 1956 page 50 http://digital.library.wisc.edu/1711.dl/WI.WIBlueBk1956 with UploadWizard