The river was first mapped by French explorers in 1688, but detailed, accurate mapping did not occur until the great astronomer and cartographer, Joseph Nicolett,(http://swcc.cc.sd.us/sitenic.htm) along with his assistant, the famed John C. Fremont, mapped the area in detail in 1839. The book by Martha Bray, Joseph Nicollet and His Map. 1994, has details of Nicolette's adventure and copies of his famous maps. For more info on the book, go to: http://www.powells.com/cgi-bin/biblio?inkey=4-087169140x-0
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Source of the Big Sioux |
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