In addition, a search of the US government database indicates that the US copyright on this magazine issue was not renewed, making it likely (but not certain) that the work is in the public domain, since it was published by an American (Bob Hoffman) in the US.

• I conducted a copyright search at copyright.gov for Strength and Health magazine. There was no information available on this title.
• In an effort to determine if there had ever been a copyright, I searched the registrations for July to December 1955 at the UPenn site, checking for both the title and the person who published the magazine, Bob Hoffman. Nothing turned up to indicate there was a copyright for the six month period of the last half of 1955.
• Am re-licensing this as not renewed, to be certain. There's nothing to indicate there are any claims on this material.

This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. 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. العربية ∙ Deutsch ∙ English ∙ español ∙ français ∙ galego ∙ italiano ∙ 日本語 ∙ 한국어 ∙ македонски ∙ português ∙ português do Brasil ∙ русский ∙ sicilianu ∙ slovenščina ∙ українська ∙ 简体中文 ∙ 繁體中文 ∙ +/−