Biblio
“Climate Response, Age Distribution, And Fire History Of A Corkbark Fir (Abies Lasiocarpa Var. Arizonica) Stand In The Santa Catalina Mountains, Arizona”. School Of Renewable Natural Resources. School Of Renewable Natural Resources. Tucson: University of Arizona.
. 2001. 
“Tree Rings A Record Of Climate Past”. Washington, D.C. : U.S. Department of Commerce National Oceanic and Atmospheric Environmental Data Service.
. 1977. “Tree Rings, Glacial Advance, And Climate In The Alps”. Zeitschrift Fur Gletscherkunde Und Glazialgeologie VII. Zeitschrift Fur Gletscherkunde Und Glazialgeologie.
. 1971. “Climate And Trees”. Nature Magazine. Nature Magazine.
. 1928. 
“Dendrochronology And Studies In Cyclics”. University Of Pennsylvania Bicentennial Conference. University Of Pennsylvania Bicentennial Conference.
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