Cleaveland, Malcolm. 1983. ?X-Ray Densitometric Measurement Of Climatic Influence On The Intra-Annual Characteristics Of Southern Semiarid Conifer Tree Rings?. Geoscience. Geoscience. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=752888331&sid=23&Fmt=2&clientId=43922&RQT=309&VName=PQD.