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==References==
==References==
*[http://www.pbs.org/weta/thewest/people/a_c/clark.htm Clark's biography on PBS]
*[https://www.pbs.org/weta/thewest/people/a_c/clark.htm Clark's biography on PBS]
*[http://www.nps.gov/archive/jeff/LewisClark2/CorpsOfDiscovery/TheLeaders/Clark/Clark.htm Clark's biography on NPS]
*[http://www.nps.gov/archive/jeff/LewisClark2/CorpsOfDiscovery/TheLeaders/Clark/Clark.htm Clark's biography on NPS]
*Ambrose, Stephen E. ''Undaunted Courage''
*Ambrose, Stephen E. ''Undaunted Courage''