Template:PD-US-no notice
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This work is in the public domain because it was published in the United States between 1923 and 1977, inclusive, without a copyright notice. Unless its author has died for several years, it is not in the public domain in the countries or areas that do not apply the rule of the shorter term for US works, such as Canada (50 pma), Mainland China (50 pma, not Hong Kong or Macao), Germany (70 pma), Mexico (100 pma), Switzerland (70 pma), and other countries with individual treaties. See this page for further explanation.
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