* The Last of the Great Scouts:The Life of William F. Cody
* The Enchanted Land:A Study of the History and Folklore of the Southwest
* Bjergene og himlen
* The Happy Warrior:A Life of George S. Patton
* America's First Wilderness:The Historical Geography of Virginia, Maryland og Delaware
* Den store amerikanske skov
* Historien om Amerikas nationalparker
* The Big Sky:A History of Colorado
* The Southwest:A History of the People
* The River and the Canyon:En historie om Colorado River og Glen Canyon
Essays og artikler
* "Grænsens betydning i amerikansk historie"
* "Den amerikanske karakter"
* "Vesten i amerikansk litteratur"
* "Nationalparkerne:Et løfte opfyldt"
* "The Colorado River:A History of Conquest"
* "The Southwest:A Unique Region"
noveller
* "Bjørnejagten"
* "Bjergmanden"
* "Den forsvundne mine"
* "Spøgelsesbyen"
* "The Cattle Drive"
Poesi
* "The Great Plains"
* "The Rocky Mountains"
* "The Desert Southwest"
* "Grand Canyon"
* "Stillehavet"