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Samuel Lewis: A Map of Lewis and Clark's Track Across
the Western Portion of North America
 
Samuel Lewis: A Map of Lewis and Clark's Track Across the Western Portion of North America from Mississippi to the Pacific Ocean. Philadelphia: 1814. Printed map. Geography & Map Division.  
           
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Quelle:
Library of Congress
http://www.loc.gov/exhibits/treasures/trr001.html