GSA-Clifford, Tom E. "Damaran Episode in the Upper Proterozoic-Lower Paleozoic Structural history of Southern Africa", Box: 78, Folder: 31. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/151183 Accessed February 26, 2025.