File:RADM Yates Stirling, Jr. from a portrait by Mabel Buell.jpg

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The edition followed in this transcription was the first, © 1939 by the author. That copyright, however, was not renewed in 1966 or 1967 as then required by law in order to be maintained. The work is thus in the public domain: details here on the copyright law involved.

Licensing

This work is in the public domain in the United States 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. Unless its author has been dead for the required period, it is copyrighted 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 Commons:Hirtle chart for further explanation. PD-US Public domain in the United States //en.wikipedia.org/wiki/File:RADM_Yates_Stirling,_Jr._from_a_portrait_by_Mabel_Buell.jpg