Tah-Koo Wah-Kan: Or The Gospel Among The Dakotas is a book written by Stephen R. Riggs and published in 1869. The book is a detailed account of the author's experiences in spreading the gospel among the Dakota Indian tribe in the mid-19th century. Riggs was a missionary who spent over 30 years living among the Dakota people, learning their language and customs, and sharing the teachings of Christianity with them. The book is divided into several chapters,...