Robert Stuart saw the American West a few years after Meriwether Lewis and William Clark and, like them, kept a journal of his epic experience. A partner in John Jacob Astor's Pacific Fur Company, the Scotsman shipped for Oregon aboard the Tonquin in 1810 and helped found the ill-fated settlement of Astoria at the mouth of the Columbia River. In 1812, facing disaster, Stuart and six others slipped away from Astoria and headed east. His journal, edited...