Correspondence of the Entomology Department, 1926-1952, and of Dean E. J. Iddings, 1935-1938; also financial records, mimeographed circulars of the Agricultural Adjustment Administration and Federal Emergency Relief Administration, correspondence and financial material relating to the University of Idaho-Ecuador Exchange program, 1954-1958, and surveys and reports relating to the Grasshopper and Mormon cricket control projects, 1938-1949.