Douglas, Diane. 1998. ?Temperature Reconstructions Spanning The Continental Divide: Bristlecone And Limber Pine Trees As Proxy Data?. Geology. Geology. Arizona State University. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=732946061&sid=18&Fmt=2&clientId=43922&RQT=309&VName=PQD.