May, Elizabeth. Anon.2008. Human response to environmental hazards: Sunset Crater as a case study. Anthropology. Anthropology. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=1564017781&sid=16&Fmt=2&clientId=43922&RQT=309&VName=PQD.