"Petroleum Prospects of the Deep Offshore" by H.D. Hedberg, J.D. Moody, and R.M. Hedberg, 1978, Box: 83, Folder: 4. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/151400 Accessed November 24, 2024.