"Philippe Buache, ""Carte des Nouvelles Decouvertes entre la partie orientale de l'Asie et l'occidentale de l'Amerique,"" from Considérations Géographiques et Physiques (Paris, 1753). Courtesy of the Newberry Library. The dotted line that parallels the Missouri River is equivalent to Moncacht-apé's route, but it ends not at the Pacific coast, but at the fabled Mer de l'Ouest that Buache and his father-in-law Guillaume Delisle had supposed since the early 1700s. (Click to enlarge in a new window.)"
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