https://www.history.com/topics/westward-expansion/lewis-and-clark
https://www.ducksters.com/biography/explorers/lewis_and_clark.php
https://kids.nationalgeographic.com/explore/history/lewis-and-clark/
http://nebraskastudies.org/1800-1849/the-louisiana-purchase/meriwether-lewis-william-clark/
https://www.pbs.org/lewisandclark/inside/idx_corp.html