Professor and historian. Correspondence (1902–1972), student papers (n.d.), theses and dissertations (1932–1933), and personal research materials (1832–1967) regarding the history of Oklahoma, Oklahoma Territory, and Indian Territory, the Indians of North America, and the American Southwest; teaching materials used by Dale at Harvard (1913–1920) and the University of Oklahoma (1921–1952); administrative and other files (1936–1941) of the Works Progress Administration’s Indian-Pioneer History Project for Oklahoma; U.S. government documents (1897–1957); and presidential papers of University of Oklahoma presidents James Shannon Buchanan (1911–1929) and Stratton D. Brooks (1915–1922).