Hallman, Christine Lee. 2010. ?Unraveling Environmental Factors That Affect Pinus Longaeva Growth In The White Mountains, California?. Geography. Geography. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=2108905281&sid=32&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Morino, Kiyomi Ann. 2008. ?Using False Rings To Reconstruct Local Drought Severity Patterns On A Semiarid River?. Geography And Regional Development. Geography And Regional Development. University of Arizona. http://ezproxy.library.arizona.edu/login?url=http://proquest.umi.com/pqdweb?did=1500068401&sid=3&Fmt=2&clientId=43922&RQT=309&VName=PQD.

Merkel, Hubert. 1984. ?Über Den Witterungseinfluß Auf Die Jahrringstruktur Der Gemeinen Keifer (Pinus Silvestris L.)?. University of Freiburg.