GSA-R.L. Johnson "Structural history of the western front of the Mozambique Belt, in N.E. Southern Rhodesia", Box: 78, Folder: 27. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/151179 Accessed February 17, 2025.