A renewal search was done in periodicals for the years 1974 and 1975. There were no listings for the Minneapolis Tribune; there's no evidence of continuing copyright.
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.
{{Information |Description=Photo of the brand new EMD FT locomotives of the Milwaukee Road. |Source=[http://web.archive.org/web/20141105042140/http://www.ebay.com/itm/1947-Original-Photo-THE-MILWAUKEE-ROAD-MILW-EMD-FT-A-B-A-Locomotive-Units-/2615901719...