A Report of the Exploring Expedition to Oregon and North California in the Years 1843-44

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"John Charles Frémont popularly known as "The Pathfinder" during his times -- played a role in opening up the American West ot settlement by pioneers His reliable accounts, including published maps, narrations, and scientific documentation of his expeditions, guided emigrants overland into the West starting in the mid-1840s. ... His second expedition -- the subject of this book -- succeeded in charting all of the way to California, mapping and confirming the Oregon Trail as the route for pioneers heading toward the West."--Back cover