The Mississippi Valley, and prehistoric events

Ancestry.com. The Mississippi Valley, and prehistoric events [database on-line]. Provo, UT: Ancestry.com Operations Inc, 2005.Original data: 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.