Du Bois, John, "Some Problems in Mayan Classification and Comparison,", 1978

Du Bois, John, "Some Problems in Mayan Classification and Comparison,", 1978, Box: 1, Folder: 87. Nora England Papers, 2023-17. Benson Latin American Collection, The University of Texas at Austin. https://archives.lib.utexas.edu/repositories/4/archival_objects/395088 Accessed September 26, 2026.