Wiseman, Fredrick Matthew. 1974. ?Paleoecology And The Prehistoric Maya: A History Of Man-Land Relationships In The Tropics?. Geoscience. Geoscience. University of Arizona.

Ames, Martha Hyde. 1972. ?Las Trampas, New Mexico: Dendrochronology Of A Spanish Colonial Church?. Department Of Geosciences. Department Of Geosciences. Tucson: University of Arizona.