AAPG-OCS-3 Master Copy, Original, and Extra Copies of Draft Report of April 8, 1981 and cover letter, Box: 47, Folder: 4. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150409 Accessed June 14, 2024.