AAPG Bockmeulen, Harry, Colin Barker, and Parke A. Dickey. "Geology and Geochemistry of Crude Oils in the bolivar Coastal Fields, Venezuela", July 1981, Box: 48, Folder: 20. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150461 Accessed November 24, 2024.