Spotted Tail (text of the treaty: "ZIN-TAH-GAH-LAT-SKAH") was one of the chiefs who signed the treaty.
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Spotted Tail, a Brulé Sioux Chief of Great Renown. National Archives.
Still Picture Branch.
111-SC-82538.
ARC Identifier: 285689.
U.S. National Archives & Records Administration
http://www.archives.gov/education/lessons/sioux-treaty/