Gonzáles-Santos, Xcaret, María Dolores Tenorio, Melania Jimenez-Reyes, and Roberto Octavio Molina-Vazquez. “Obsidians from the Archaeological Site of San Francisco Toxpan, Mexico: Supply Sources and Trade Routes”. Semina: Ciências Exatas e Tecnológicas 44 (September 29, 2023). Accessed May 13, 2024. https://ojs.uel.br/revistas/uel/index.php/semexatas/article/view/48250.