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2. Root William C. . 1962 Report on the metal objects from Mayapan. In H. E. D. Pollack, Mayapan, Yucatan, Mexico. Carnegie Institute of Washington Publication 9:391–399:
3. A study of some copper objects from Guatemala. In B. P. Dutton, Excavations at Tajumulco, Guatemala;Root;School of American Research, Monograph,1943
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