Excursion Stratigraphique et Sedimentologique dans le Cambro-Ordovicien du Jebel Fezzan, 1963, Box: 32, Folder: 25. J. Harlan Johnson papers, RH MS 735. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/53931 Accessed December 12, 2024.