- "Oregon," in the Encyclopædia Britannica, Ninth Edition (1875-1889)
- "Oregon" (Russian: "Орегон"), in the Brockhaus and Efron Encyclopedic Dictionary (Russian: "Энциклопедический словарь"), Volume XXII (1897)
- "Oregon" (Russian: "Орегон"), in the Small Brockhaus and Efron Encyclopedic Dictionary (Russian: "Малый энциклопедический словарь Брокгауза и Ефрона") (1899-1902)
- "Oregon" (Russian: "Орегон"), in the Jewish Encyclopedia of Brockhaus and Efron (Russian: "Еврейская энциклопедия") (1906-1913)
- "Oregon," in the Encyclopædia Britannica (1911)
- "Oregon" (Russian: "Орегон"), in the New Encyclopedic Dictionary (Russian: "Новый энциклопедический словарь") (1911-1916)
- "Oregon," in The New Student's Reference Work (1914)
- Oregon: Her history, her great men, her literature, a historical work by Johan Baptiste Horner (1919)
- Oregon, My Oregon, the official state song of Oregon, by John Andrew Buchanan, music by Henry Bernard Murtagh (1920)
- "Oregon," in Collier's New Encyclopedia (1921)
- "Oregon," in the Encyclopædia Britannica (1922)
- Oregon, End of the Trail, a book on the state of Oregon compiled by the Writers' Program of the Work Projects Administration (1940)
See also