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.
photos from a 1952 Popular Mechanics article showing Robert and Virginia Heinlein's house in Colorado, which they designed source: http://www.nitrosyncretic.com/rah/pm652-art-hi.html . The source web site states, at http://www.nitrosyncretic.com/rah/srah
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