* The Master of Darkness (1931)
* The Scourge (1933)
* In the Claws of the Eagle (1934)
* The Blood of the Templars (1935)
* Faraoenes forbannelse (1936)
* Inkaenes hemmelighet (1937)
* The Mystery of the Maya (1938)
* The Riddle of the Sfinx (1939)
* The Ghost of Belshazzar (1940)
* The Shadow of Alexander the Great (1941)
* The Last of the Borgias (1942)
* Konstantinopels fall (1943)
* Beleiringen av Wien (1944)
* Slaget ved Waterloo (1945)
* The Charge of the Light Brigade (1946)
* The Mytery on the Bounty (1947)
* The Gold Rush (1948)
* The California Trail (1949)
* The Oregon Trail (1950)
* The Santa Fe Trail (1951)
* The Chisholm Trail (1952)
* The Natchez Trace (1953)
* The Wilderness Road (1954)
* The Cumberland Road (1955)
* Den gamle spanske stien (1956)
* The Mormon Trail (1957)
Noveller:
* The Werewolf of London (1927)
* The Vampire of Paris (1928)
* Golem i Praha (1929)
* Mumien fra Theben (1930)
* The Witch of Endor (1932)
Andre verk:
* Albanias historie (1939)
* Balkankrigene (1940)
* Første verdenskrig (1941)
* Andre verdenskrig (1942)
* Den kalde krigen (1943)
* USAs historie (1944)
* The History of Europe (1945)
* Verdens historie (1946)
* Bibelen (1947)
* Koranen (1948)
* The Bhagavad Gita (1949)
* The Tao Te Ching (1950)
* The Analects of Confucius (1951)
* The Dhammapada (1952)
* The Upanishads (1953)
* Vedaene (1954)
* The Zend-Avesta (1955)
* The Popol Vuh (1956)
* The Rigveda (1957)