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Cobean, R. H., & Stocker T. L.  (2002).\'a0\'a0Obsidian Sources on or Near the Slopes of Pico de Orizaba Volcano.  (Cobean, Robert H., Ed.).\ul A world of obsidian: The mining and trade of a volcanic glass in ancient Mexico [Un mundo de obsidiana: miner\'eda y comercio de un vidrio volc\'e1nico en el M\'e9xico antiguo]. \ul0  131-182.\par \par }