Professor and chemist. Correspondence and reports (1897–1950) regarding essays, autopsies, chemical analyses, and consultations conducted by DeBarr; services rendered by DeBarr as expert witness in legal cases; the DeBarr family and personal affairs; members of the University of Oklahoma faculty and Board of Regents; and the construction and laboratory fittings of the University of Oklahoma’s chemistry building, including a report (1870–1872) on the survey of the Indian Meridian boundary through Indian Territory.