Image: Pony Express centennial stamp 4c 1960 issue
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Description: Pony Express 100th anniversary commemorative issue of 1960
Title: Pony Express centennial stamp 4c 1960 issue
Credit: U.S. Post Office; Smithsonian National Postal Museum
Author: Bureau of Engraving and Printing; Imaging by Gwillhickers
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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