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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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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