1. A model of Mesoamerican obsidian technology based on workshop debris in El Salvador.;Sheets;Ceramica de Cultura Maya,1972
2. Notes on large obsidian blade cores and core-blade technology in Mesoamerica.;Hester;University of California Archaeological Research Facility, Contributions,1972
3. Lugares arqueológicos del Altiplano Meridonial Central de Guatemala.;Shook;Arqueologia Guatemalteca,1957
4. Obsidian Trade at San Lorenzo Tenochtitlan, Mexico