ocr: some obsidian workshops contain a high proportion of tools made by striking blades from a' "core" of obsidian; others have a high proportion of tools made by chipping a piece of obsidian until the desired shape was obtained. Similar evidence of specialization among potters is found in the southwestern part of the city. There, during Teotihuacan's period of greatest expansion, one group of potters concentrated on the mass production ofthe most common type of cooking ware. The crafts of Teotihuacan must have helped enrich the city. So too, no doubt, did the pilgrim traffic. In addition to the th ...
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