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.
Rep. Michael K. Reilly (D-WI). The State of Wisconsin Digital Collection. http://digicoll.library.wisc.edu/cgi-bin/WI/WI-idx?type=turn&entity=WI.WIBlueBk1931.p0463&isize=M Scan of page 15 of the Wisconsin State Blue Book 1933, dipicting official photos of