"Platygonus" [correspondence, illustrations, photographs, and scholarly paper with Gerard R. Case], 1970, 1972, undated

"Platygonus" [correspondence, illustrations, photographs, and scholarly paper with Gerard R. Case], 1970, 1972, undated, Box: 7, Folder: 4. Personal papers of Larry D. Martin, PP 630. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/494487 Accessed December 24, 2025.