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Ancestry.com. The Mississippi Valley, and prehistoric events [webbaserad databas]. Provo, UT: Ancestry.com Operations Inc, 2005.Originaldata: Walker, C. B.. The Mississippi Valley, and prehistoric events : giving an account of the original formation and early condition of the great valley, of its vegetable and animal life, of its first inhabitants, the mound builders, its mineral treasures and agricultural developments : all from authentic sources. Burlington, Iowa: R.T. Root, 1880, c1878.