PBS
Frontier House: The Extermination of the American Buffalo
The reign of the buffalo across the plains ended in great slaughter by the end of the 19th century. This companion essay to the PBS series, Frontier House, recounts how the decimation of the buffalo occurred, hastened by both white and...
Other
Trans Mississippi and International Exposition: The Arapaho Tribe
Provides general information on the Arapaho tribe, the buffalo hunters of the Great Plains.
University of Calgary
Native Civilizations
Blackfoot, Cree and Sioux cultures inhabited the plains. They were nomadic people who followed the roaming buffalo herds, hunting as needed to supply the essentials of life.
Legends of America
Legends of America: Arapaho Great Buffalo Hunters of the Plains
A very good overview of Arapaho history. It explains how the Arapaho split into the Northern and Southern Arapaho tribes and their relationships with the Cheyenne and the Sioux.
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.