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The author died in 1941, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer.
For further explanation, see Commons:Hirtle chart.
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.