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Duke University
California Gold: The Diary and Letters of James M. Burr
Wonderful primary resource on the California Gold Rush. Read actual letters and a diary--with explanatory annotations--by a prospector from 1850-1853.
Library of Congress
Loc: Nation Expansion and Reform: Traveling on the Overland Trails, 1843 1860
Primary source information about traveling the Overland Trails, both to Oregon Country and California.