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. 
“The Effects Of Mountains On The Quality Of The Atmosphere”. Popular Astronomy . Popular Astronomy .
. 1899. 