* The Bells of Old St. Paul's (1908)
* Lille rød vante (1909)
* The Making of a Girl (1910)
* The Adventures of Jack (1912)
* Når mor lader os lege (1914)
* På sporet (1916)
* I skoletiden (1918)
* Spejderne på ferie (1920)
* Den unge mineralog (1922)
* Den unge jernbanemand (1924)
* Den unge tømmermand (1926)
* Den unge journalist (1928)
* Den unge læge (1930)
* Den unge advokat (1932)
* Den unge ingeniør (1934)
* Den unge opfinder (1936)
* Den unge kemiker (1938)
* The Young Aviator (1940)
* Den unge marinesoldat (1942)
* Den unge soldat (1944)
* Den unge sømand (1946)
* Den unge flyver (1948)
Faglitteratur:
* Historiske og biografiske skitser af Old St. Paul's (1895)
* The Chronicles of St. Paul (1904)
* Historien om St. Paul (1906)
* Minnesota Stories (1908)
* Tales of the Northwest (1909)
* Legends of Minnesota (1910)
* De store søer (1911)
* The Mississippi Valley (1912)
* Rocky Mountains (1913)
* Nordvestkysten (1914)
* Den sydvestlige ørken (1915)
* De østlige stater (1916)
* Sydstaterne (1917)
* Mellemstaterne (1918)
* De vestlige stater (1919)
* Nordstaterne (1920)
* USA (1921)
* Verden (1922)
* Solsystemet (1923)
* Universet (1924)
Børnebøger:
* A B C-bogen (1900)
* Min bog (1901)
* Din bog (1902)
* Hans bog (1903)
* Hendes bog (1904)
* Babyens bog (1905)
* The Child's Book (1906)
* Drengens bog (1907)
* Pigebogen (1908)
* De unges bog (1909)
* Børnebogen (1910)
* De små folks bog (1911)
* The Wee Folks' Book (1912)
* The Tiny Tots' Book (1913)
* The Babykins' Book (1914)
* De mindstes bog (1915)
* The Mother Goose Book (1916)
* Nursery Rhyme Book (1917)
* Eventyrbogen (1918)
* Bibelens historiebog (1919)
* The Christmas Story Book (1920)
* The Easter Story Book (1921)
* The Thanksgiving Story Book (1922)
* Den fjerde juli-historiebog (1923)
* The Lincoln Story Book (1924)
* The Washington Story Book (1925)
* The Roosevelt Story Book (1926)
* The Columbus Story Book (1927)
* The Pilgrims Story Book (1928)
* The Pioneers Story Book (1929)
* The Indians Story Book (1930)
* The Negroes Story Book (1931)
* Den kinesiske historiebog (1932)
* Den japanske historiebog (1933)
* Den indiske historiebog (1934)
* The Eskimo Story Book (1935)
* Den afrikanske historiebog (1936)
* Den australske historiebog (1937)
* The New Zealand Story Book (1938)
* The Hawaiian Story Book (1939)
* The Philippine Story Book (1940)
* The Puerto Rico Story Book (1941)
* The Virgin Islands Story Book (1942)
* The Alaska Story Book (1943)
* The Hawaii Story Book (1944)
* The Guam Story Book (1945)
* The Wake Island Story Book (1946)
* The Midway Story Book (1947)
* The Iwo Jima Story Book (1948)
* The Okinawa Story Book (1949)
* The Korea Story Book (1950)
* The Vietnam Story Book (1951)