A search for renewals was done in artwork for the years 1970 and 1971. There were no renewals in this category for any items owned by any person or company named Olson. There's no evidence that copyright continues to be claimed on this material.
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=Postcard photo of en:Olson Park and Waterfall in Chicago. |Source=[http://www.ebay.com/itm/Vintage-Postcard-Waterfalls-and-Rock-Garden-in-Olson-Park-Chicago-1940s-/231244269415?pt=LH_DefaultDomain_0&hash=item35d73b8767 e...
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