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Article cites James R. Ehleringer, Lois A. Arnow, Ted Arnow, Irving B. McNulty, Norman C. Negus; Red Butte Canyon Research Natural Area: history, flora, geology, climate, and ecology. Western North American Naturalist, Vol 52, No 2 (1992) as its source. http://redbuttecanyon.net/protectedwatershed.html also uses this research as its primary source.
