克拉克的地圖，涵蓋了密蘇里州的大瀑布及洛磯山脈(Rocky Mountains)

出處: "Map of Lewis & Clark's treck across the western portion of North America." Philadelphia : Bradford and Insskeep, 1814. Trails to Utah and the Pacific: Diaries and Letters, 1846-1869 from the Library of Congress.