PBS
Pbs: The Native Americans
The Corps of Discovery came into contact with "Nearly 50 Native American tribes." This site from PBS discusses the tribes that had the most significant interactions with Lewis and Clark.
Other
Trail tribes.org: Lakota
An excellent resource on the Lakota tribe. It covers the Lakota's' modern and historical culture, as well as the tribe's relationship with the United States during the days of European settlers. This site provides valuable information...
PBS
Mpr: The Meaning of Sioux Music and Song
This site from the Minnesota Public Radio provides the text of a 1915 article written by musician and self-trained anthropologist, Frances Densmore. Densmore spent years studying the music and culture of the Teton Sioux and other native...
PBS
Pbs: Lewis and Clark: Teton Sioux Indians
A look at the hostile encounter between the Teton Sioux and the men of the Corps of Discovery on their voyage up the Missouri River in 1804. From PBS.
PBS
Pbs: Teton Sioux Indians
This site from PBS contains an article on the Teton Sioux Indians and the Lewis and Clark expedition.