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Morley, Sylvanus (1938). "The Age and Provenance of the Leyden Plate"(PDF). Mesoamerica. from Contribution to American Anthropology and History no. 24. Archived(PDF) from the original on 8 December 2011. Retrieved 22 August 2017.
Morley, Sylvanus (1938). "The Age and Provenance of the Leyden Plate"(PDF). Mesoamerica. from Contribution to American Anthropology and History no. 24. Archived(PDF) from the original on 8 December 2011. Retrieved 22 August 2017.
Morley, Sylvanus (1938). "The Age and Provenance of the Leyden Plate"(PDF). Mesoamerica. from Contribution to American Anthropology and History no. 24. Archived(PDF) from the original on 8 December 2011. Retrieved 22 August 2017.
Morley, Sylvanus (1938). "The Age and Provenance of the Leyden Plate"(PDF). Mesoamerica. from Contribution to American Anthropology and History no. 24. Archived(PDF) from the original on 8 December 2011. Retrieved 22 August 2017.