4. Pilcher's letters are dated June 10 and July 1, 1837. The letters do not appear to have reached Clark in St. Louis until the fall of 1837, due to the lack of reliable mail service given Pilcher's location beyond the frontier. In M234, Roll 884, Letters Received by the Office of Indian Affairs, 1824-1880, Upper Missouri Agency, 1824-1874, National Archives (hereafter cited as "National Archives")

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