N. E. West, R. J. Tausch, K. H. Rea, P. T. Tueller, Taxonomic Determination, Distribution, and Ecological Indicator Values of Sagebrush within the Pinyon-Juniper Woodlands of the Great Basin, Journal of Range Management, Vol. 31, No. 2 (Mar., 1978), pp. 87-92
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West et al. (1978) studied this question.
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