ocr: the local material to the mass production of blade implements. Trade in raw obsidian and obsidian implements became increasingly important to the economy of Teotihuacan, reaching a peak toward the middle of the first millennium A.D. The investigation of Teotihuacan was carried forward by specialists working on three independent but related projects. One project was a monumental program of excavation and reconstruction undertaken by Mexico's National Institute of Anthro- pology, headed by Eusebio Davalos. From 1962 to 1964, archaeologists under the direction of Ignacio Bernal, director of the 9 ...
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