"A Meeting for Discussion: The Structures and Evolution of the Red Sea, Gulf of Aden and Ethiopian Rift Junction" The Royal Society, March 1969, Box: 10, Folder: 32. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/149254 Accessed November 24, 2024.