Geologic Controls on Petroleum Genesis, H.D. Hedberg paper for 7th World Pet. Congress, Mexico City, April 1967, Box: 94, Folder: 11. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/151759 Accessed November 28, 2024.