U.S. dept of interior petroleum symposium; "The effect of advancing technology-geology" by D.A. McGee, Washington, DC, March 9, 1967, Box: 174, Folder: 10. Dean A. McGee papers, RH MS 537. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/156590 Accessed June 20, 2025.