Biblio
“Las Trampas, New Mexico: Dendrochronology Of A Spanish Colonial Church”. Department Of Geosciences. Department Of Geosciences. Tucson: University of Arizona.
. 1972. 
“Paleoecology And The Prehistoric Maya: A History Of Man-Land Relationships In The Tropics”. Geoscience. Geoscience. University of Arizona.
. 1974.