* _Shambleau_ (1933)
* _De underlige verdener_ (1940)
* _Judgment Night_ (1952)
* _Sangen om Minla_ (1953)
* _Nordvest for Jorden_ (1954)
* _Island in the Sky_ (1954)
* _Dommedagsmorgen_ (1957)
* _Heksens datter_ (1957)
* _Stjernerne er vores!_ (1958)
* Fantasi:
* _Black God's Shadow_ (1934)
* _Jirel of Joiry_ (1939)
* _Sirenernes sang_ (1940)
* _Khokarsa the Wonder-Weaver_ (1942)
* _The Jirel of Joiry-historier_ (1950)
* _The Darkest Dawn_ (1952)
* _Alle katte er grå_ (1952)
* _Den tabte port_ (1954)
* _Livets træ_ (1960)
* _Sword in the Star_ (1960)
* Westerns:
* _The Gun-Tamer_ (1931)
* _The Law of the Gun_ (1931)
* _Sheriffens søn_ (1932)
* _The Fighting Fool_ (1932)
* _The Rustlers_ (1933)
* Mysterium:
* _Hvem er hr. Valentine?_ (1933)
* _Mysteriet om det spanske sjal_ (1934)
* _Skygge i huset_ (1934)
* _The Shadow Strikes_ (1934)
* _The Case of the Dead Man's Hand_ (1935)
* _Sagen om det skjulte vidne_ (1935)
* _The Case of the Mysterious Lady_ (1936)
* _Sagen om den forsvundne brudgom_ (1936)
* _Sagen om den myrdede golfspiller_ (1937)
* _Sagen om det forsvindende lig_ (1937)
* noveller:
* "Heksens datter" (1935)
* "The Judgment of Eva" (1940)
* "Shambleau og andre" (1933)
* "Dommemanden" (1932)
* "The Return of Jirel of Joiry" (1939)
* "Rædselen fra afgrunden" (1934)
* "The Song of the Dead" (1941)
* "Det mørke land" (1936)
* "The Bright Face of Danger" (1942)
* "The Lady of the Lost Isle" (1937)