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Curated OER
National Park Service: California National Historic Trail
This site from the National Parks Service gives a brief history, and description of the California trail system which was used by settlers moving to California during the 1849 Gold Rush days.
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.