English: The first RPO (1862) on a picture post card (ppc) published for the 1933 "Century of Progress" Exposition at Chicago, IL, (with Aug. 25, 1933 RPO Exhibit CDS)
The Cooper Collection of U.S. Railroad History (Private Collection)
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Postcard
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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.
The first RPO (1862) on a picture post card (ppc) published for the USPOD exhibit at the "Century of Progress" Exposition at Chicago, IL, in 1933 (with Aug. 25, 1933 CDS) <small>''The Cooper Collection of U.S. Railroad History'' (Private Collection)</sm
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