West, Carla Van. 1990. ?Modeling Prehistoric Climatic Variability And Agricultural Production In Southwestern Colorado: A Gis Approach?. Anthropology. Anthropology. Washington State University. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=747133751&sid=7&Fmt=2&clientId=43922&RQT=309&VName=PQD.