[15] The scientific expedition started in the summer of 1842 and was to explore the Wind River of the Rocky Mountains, examine the Oregon Trail through the South Pass, and report on the rivers, fertility of the lands, find optimal sites for forts, and the nature of the mountains beyond in Wyoming.
[15] L’expédizione scientifique a inceput nell’été del 1842 e era a explorare la rivia della venta della Montagne Rocky, a l’experienza della Trail Oregon a traversarlo del South Pass, e a racontere la rivia, la fertilità della territoria, a travaggiare sito optimali per forts e la natura dei monti dal Wyoming.