Pohl, Mary; Kevin O. Pope, Christopher von Nagy (2002) "Olmec Origins of Mesoamerican Writing, in Science, vol. 298, pp. 1984-1987. I, the copyright holder
Pohl, Mary; Kevin O. Pope, Christopher von Nagy (2002) "Olmec Origins of Mesoamerican Writing, in Science, vol. 298, pp. 1984-1987. I, the copyright holder