{\rtf1\ansi\deff0\deftab360 {\fonttbl {\f0\fswiss\fcharset0 Arial} {\f1\froman\fcharset0 Times New Roman} {\f2\fswiss\fcharset0 Verdana} {\f3\froman\fcharset2 Symbol} } {\colortbl; \red0\green0\blue0; } {\info {\author Biblio}{\operator }{\title Biblio RTF Export}} \f1\fs24 \paperw11907\paperh16839 \pgncont\pgndec\pgnstarts1\pgnrestart 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 }