Speer, James Hardy. 1997. ?A Dendrochronological Record Of Pandora Moth (Coloradia Pandora, Blake) Outbreaks In Central Oregon?. Geoscience. Geoscience. Tucson: University of Arizona.

Schweingruber, Fritz H, Raymond  Kontic, and Amanda  Winkler-Seifert. 1983. ?Eine Jahrringanalytische Studie Zum Nadelbaumsterben In Der Schweiz?. Berichte Rapports. Berichte Rapports. Birmensdorf: Eidgenossische Anstalt fur das Forstliche Versuchswesen.

Fritts, H. 1966. ?Growth Rings Of Trees: Their Correlation With Climate?. Science. Science.

Douglass, AE. 1914. ?A Method Of Estimating Rainfall By The Growth Of Trees?. Bulletin Of The American Geographic Society XLVI. Bulletin Of The American Geographic Society.