Biblio
. Anon.1974. Paleoecology and the Prehistoric Maya: A History of Man-Land Relationships in the Tropics. Geoscience. Geoscience. University of Arizona.
. Anon.1972. Las Trampas, New Mexico: Dendrochronology of a Spanish Colonial Church. Department of Geosciences. Department of Geosciences. Tucson: University of Arizona.
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