Abstract
O WING to the unique fashion in which the Colorado River has carved out its V-shaped canyon through a high plateau region, a greater number of life zones exist within the boundaries of the Grand Canyon National Park than would ordinarily be expected in an area of corresponding size. Within a crowflight distance of less than ten miles, there are represented all the life zones from Desert Lower Sonoran to timbered portions of the Kaibab Plateau which have been considered Canadian Zone.'
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