W.G. Siesser Gulf Coast Palogene Strata: Groups or Stages? Journal of Geology, November 1983, Box: 48, Folder: 23. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150464 Accessed November 24, 2024.