Tah-Koo Wah-Kan: Or The Gospel Among The Dakotas is a book written by Stephen R. Riggs and published in 1869. The book provides a detailed account of the author's experiences as a missionary among the Dakota people in Minnesota during the mid-19th century. Riggs was a member of the American Board of Commissioners for Foreign Missions and spent several decades living among the Dakota, learning their language and culture, and spreading the Christian...