Templet:PD-US-defective notice
This work is in the public domain because it was published in the United States between 1923 and 1977, inclusive, with a defective copyright notice containing at least one of the following defects:
A defective notice does not invalidate copyright in cases where the error is immaterial and would not mislead an infringer, such as an abbreviated name. Additionally, foreign works created outside the US are subject to copyright restoration even with a defective notice. 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, Mainland China (not Hong Kong or Macao), Germany, Mexico, Switzerland, and other countries with individual treaties. |
Source: [1]