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.
First known publication in 1956 in the Brown Bulletin, linked to in the "source" field. A search of the US copyright office catalog database at http://cocatalog.loc.gov shows no extension of copyright for the magazine and its contents. Unsurprising, since the company had ceased to exist by the 1980s.
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