- The Story of the Frontier: A Social History of the Northern Plains and Rocky Mountains
- The Lure of the Land; A Social History of the Public Lands from the Articles of Confederation to the New Deal
- The Dixie Frontier: A Social History of the Southern Frontier from the First Transmontane Beginnings to the Civil War
- Life in the West Before the Sod House Frontier
- The Sod House Frontier, 1854-1890