AAPG Lohman, Frank H, A Sketch of the Tectonic History of the Bolivian Andes, 1968, Box: 56, Folder: 57. Hollis Hedberg papers, RH MS 546. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/150729 Accessed June 15, 2025.