The best collection of published biographies in Oklahoma is at the Oklahoma Historical Society http://www.okhistory.org/. The Family History Library has several helpful biographical works. There is no statewide biographical index or major manuscript collection. State, regional, and county histories often have biographical sections containing valuable information. Some representative biographical encyclopedias are:
Portrait and Biographical Record of Oklahoma: Commemorating the Achievements of Citizens who have Contributed to the Progress of Oklahoma and the Development of Its Resources. Chicago, Illinois: Chapman Publishing Co., 1901. (Family History Library book 976.6 D3p; film 874,324.)
Thoburn, Joseph Bradfield. A Standard History of Oklahoma: an Authentic Narrative of Its Development from the Date of the First European Exploration Down to the Present Time, Including Accounts of the Indian Tribes, both Civilized and Wild, of the Cattle Range, of the Land Openings and the Achievements of the Most Recent Period. 5 vols. Chicago, Illinois: American Historical Society, 1916. (Vols. 2-5 on Family History Library film 1,425,716 items 1-4.)
Hill, Luther B. A History of the State of Oklahoma. 2 vols. Chicago, Illinois: Lewis Publishing Co., 1908. (Family History Library book 976.6 H2h; film 1,000,353 items 1-2;
fiche 6,051,224.) Volume 2 contains biographies.
Oklahoma Historical Society. Chronicles of Oklahoma (see "Periodicals" section in this outline).
Biographical sketches of residents of Indian Territory (see the “History” section of this outline) are published in: O'Beirne, Harry F. and Edward S. The Indian Territory: Its Chiefs, Legislators and Leading Men. St. Louis, Missouri: C. B. Woodward Co., 1892. (Family History Library film 989,201 item 2.)
O'Beirne, Harry F. Leaders and Leading Men of the Indian Territory with Interesting Biographical Sketches: Choctaws and Chickasaws. Chicago, Illinois: American Publishers Association, 1891. (Family History Library film 1,000,354, item 1.)
Indian Pioneer Papers, 1860 - 1935 (Millwood, New York : Kraus Microform, 1989) FHL 6016865-6016981 Contains interviews of 11,000 early settlers of Oklahoma still living in the 1930's. The interviews contain a information regarding their migration to Oklahoma and life in those early days. Indian Pioneer Papers Index at OkGenWeb Oklahoma Genealogy Actual online records at The University of Oklahoma Western History Collections.