http://montanakids.com/history_and_prehistory/lewis_and_clark/plants_animals.htm
https://www.nps.gov/nr/travel/lewisandclark/encounters.htm
https://www.mrnussbaum.com/lewis-clark/discoveries/
https://www.nps.gov/jeff/learn/historyculture/the-lewis-and-clark-journey-of-discovery.htm
http://www.american-historama.org/1801-1828-evolution/lewis-and-clark-explorations.htm