Gulf Eval-33 Evaluation of Gulf's Exploration and Production Effort in the United States--and Recommendations by I.G. Davis and H.D. Hedberg, Box: 27, Folder: 8. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/149682 Accessed November 24, 2024.