HDH lecture--"Why Explore the Deep Offshore" Southwestern Legal Foundation, Dallas, Texas. Dr. Andrew Cecil, Gen. Dir. Int. O, March 8-10, 1967, Box: 94, Folder: 23. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/151771 Accessed November 24, 2024.