Combien d'années a duré le service de livraison du courrier Pony Express ?
How many years did the Pony Express mail delivery service last?
The Pony Express was in operation for just around one-and-a-half years, from April 1860 to October 1861.
Le Pony Express a fonctionné pendant environ un an et demi, d'avril 1860 à octobre 1861.
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