5 books
History of the Discovery of the Northwest by John Nicolet in 1634
Washington-Irvine Correspondence
History of Brulé's Discoveries and Explorations, 1610-1626; Being a Narrative of the Discovery, by Stephen Brulé of Lakes Huron, Ontario and Superior; and of His Exploration (the First Made by Civilized Man) of Pennsylvania and Western New York
History of Brule's Discoveries and Explorations, 1610-1626
History of George Rogers Clark's Conquest of the Illinois and the Wabash Towns, 1778 and 1779