Professor. Personal correspondence (1897-1957); correspondence with Campbell's relatives (1822-1896); correspondence with publishers and literary agents (1920-1958); literary manuscripts (ca. 1914-1957); diaries, notebooks, and journals...
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...