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Moreover, there was no registration or renewal of a copyright subsequent to publication according with the U.S. Copyright Office. This results in automatic release of the work into the public domain since it was published between 1923 and 1963. For further information, see Copyright Term and the Public Domain in the United States (Cornell University).
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.