Detektiv fiktion:
- "The Cross Roads Murder" (1921)
- "Mordet i Zoo" (1923)
- "The Ghost of Ward's Mill" (1925)
- "Det Blå Kors" (1926)
- "The Crimson Claw" (1927)
- "Den kinesiske papegøje" (1930)
- "The Clue of the Red Wig" (1932)
- "The Riddle of the Travelling Show" (1934)
- "The Case of the Dead Millionaire" (1936)
- "Mysteriet om det låste rum" (1938)
Westerns:
- "The Sagebrush Law" (1920)
- "Ørkenfejden" (1922)
- "The Range Boss" (1924)
- "The Outlaw Trail" (1926)
- "The Lone Star Ranger" (1928)
- "The Branded Man" (1930)
- "Den kæmpende sherif" (1932)
- "The Gun-Runner" (1934)
- "The Last Roundup" (1936)
- "Manden fra Texas" (1938)
Historiske romaner:
- "The Scarlet Dawn" (1919)
- "The Maid of Orleans" (1921)
- "Korsridderen" (1923)
- "Den sorte prins" (1925)
- "Kongemageren" (1927)
- "Nordens stjerne" (1929)
- "Sværdet og korset" (1931)
- "The Last of the Mohicans" (1933)
- "The Oregon Trail" (1935)
- "The Forty-Niner" (1937)
True-Crime-historier:
- "Mord på havnefronten" (1940)
- "Sagen om den forsvundne arving" (1942)
- "Mysteriet om den forgiftede pen" (1944)
- "Damen i søen" (1946)
- "Manden med arret" (1948)
- "Liget i skabet" (1950)
- "Sagen om det forsvindende lig" (1952)
- "Mordet i værelse 13" (1954)
- "The Poisoned Pen" (1956)
- "The Strange Case of Dr. Jekyll and Mr. Hyde" (1958)
Andre værker:
- "En rigtig drengs eventyr" (1917)
- "The Jungle Fighters" (1918)
- "The Airmen of the Lost Patrol" (1945)
- "Dinosaurernes forsvundne verden" (1947)
- "Grotternes hemmelighed" (1949)
- "Mysteriet om den skjulte skat" (1951)
- "The Phantom of the Opera" (1953)
- "The Case of the Haunted House" (1955)
- "The Secret of Skull Mountain" (1957)
- "Mumiens forbandelse" (1959)