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4. Folan W. J., Información Universidad Autónoma Ciudad de México (UACM) 13, 122 (1988).
5. B. L. Turner in Population Reconstruction for the Central Maya Lowlands: 1000 B.C. to A.D. 1500 T. P. Culbert D. S. Rice Eds. (Univ. of New Mexico Press Albuquerque NM 1990) pp.
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