- Rise of the New West, 1819-1829
- The Passing of the Frontier: A Chronicle of the Old West
- The Story of the Outlaw: A Study of the Western Desperado
- The Winning of the West, Volume 1: From the Alleghanies to the Mississippi, 1769-1776
- The Winning of the West, Volume 2: From the Alleghanies to the Mississippi, 1777-1783
- The Winning of the West, Volume 3: The Founding of the Trans-Alleghany Commonwealths, 1784-1790
- The Winning of the West, Volume 4: Louisiana and the Northwest, 1791-1807