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In page Pony Express:

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The foundation of accountable Pony Express history rests in the few tangible areas where records, papers, letters, and mailings have yielded the most historical evidence. Until the 1950s, most of what was known about the short-lived Pony Express was the product of a few accounts, hearsay, and folklore, generally true in their overall aspects, but lacking in verification in many areas for those who wanted to explore the history surrounding the founders, the various riders, and station keepers, or who were interested in stations or forts along the Pony Express route.[citation needed]