This work is in thepublic domainin the United States because it waspublishedin the United States between 1929 and 1977, inclusive,without acopyright notice.For further explanation, seeCommons:Hirtle chartas well as adetailed definitionof "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply therule of the shorter termfor US works (depending on the date of the author's death), such as Canada (50p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.