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The 1957-1965 Tulane University excavations at Dzibilchaltun recovered thousands of artifacts of many materials. Most of these objects date to the Late Classic period (Early period II and the Pure Florescent, ca. A.D. 700-1000), when the community of more than 25,000 persons covered 16 km2, but the collection spans the years from 600 B.C. until the arrival of the Spanish. It is the only large excavated collection of artifacts from a northern Maya site to cover this large a part of the prehispanic past.