PBS
Pbs: Lewis and Clark: Yankton Sioux Indians
Read about what the Yankton Sioux wanted from Lewis and Clark and why they were disappointed when they met the Corps of Discovery on its journey up the Missouri River. From PBS.
US Army Center
U.s. Army Center of Military History: Lewis and Clark: Corps of Discovery: The Mandan Indian Nation
Find a description of the Mandan culture, housing, and daily way of life. Included are photographs of Mandan villages and houses.