Bibliography

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2002
Cobean, R. H., & Stocker T. L. (2002).  Obsidian Sources on or Near the Slopes of Pico de Orizaba Volcano. (Cobean, Robert H., Ed.).A world of obsidian: The mining and trade of a volcanic glass in ancient Mexico [Un mundo de obsidiana: minería y comercio de un vidrio volcánico en el México antiguo]. 131-182.
1991
1971