ocr: As the Mexican archaeologists were at work, agroup under the direction of William T. Sanders of Pennsylvania State University conducted an intensive study of the ecology and the rural settlement patterns of the valley. Another group, from the University of Rochester, initiated a mapping project under my direction. This last effort involves preparing a topographic map on which all the city's several thousand structures will be located. The necessary intormation is being secured by the examination of surface remains, supplemented by small-scale excavations. One result of our work has been to dem ...
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