Biondi, Franco. 1987. ?Influence Of Gambel Oak On Radial Growth Of Southwestn Ponderosa Pine: A Dendrochronological Study?. School Of Renewable Natural Resources. School Of Renewable Natural Resources. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=754449011&sid=5&Fmt=2&clientId=43922&RQT=309&VName=PQD.