Fantasy

• Silverlock (1949), E. P. Dutton, reprinted by Ace Books, ISBN 0441766722
• The Moon's Fire-Eating Daughter (1981), The Donning Company, ISBN 0898650798

Historical Fiction

• The Harp and the Blade (1941), subject: medieval France
• Out on Any Limb (1942), subject: Elizabethan England
• The Wild Yazoo (1947), subject: the Mississippi frontier
• Dead Warrior (1956), western
• I, Jack Swilling (1961), western

Poetry

• Maverick Zone (1961), subject: the American Old West

• The Alamo (1948)
• The Last Chance: Tombstone's Early Years (1950)
• Doc Holliday (1955)
• The Deaths of the Bravos (1962), Western history
• The Saga of Hugh Glass: Pirate, Pawnee, and Mountain Man (1963), reprinted by University of Nebraska Press, ISBN 0803208677
• San Francisco's Reign of Terror (1966)
• Print in a Wild Land (1967)
• The Westerners: A Roundup of Pioneer Reminiscences (1969)
• The Border Wardens: A History of the United States Border Patrol and Its Ceaseless Struggle to Stem the Tide of Wetbacks, Booze and Pot Across America's Wildest Boundary(1971), ISBN 0130802182