Advisory Council; Correspondence 1970-1986, Minutes 1976-1986. Heller, Charles A. Correspondence 1967-1985, 1967 - 1986, Box: 37/1.3. Records of the Kansas State Geological Survey, RG 37. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/540759 Accessed June 26, 2024.