English: Advertisement for scenic airplane rides on Maddux Airlines from Grand Central Air Terminal, Glendale, CA, to see the German airship Graf Zeppelin at Mines Field, Los Angeles, scanned from the Los Angeles TIMES, August 26, 1929
Source: The Cooper Collection of US Aviation History
Photograph by uploader.
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This work is in the public domain in the United States because it was published in the United States between 1929 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.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.