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Laura J. Key, Lynda F. Delph, Daniel B. Thompson, Erik P. Van Hoogenstyn, Edaphic Factors and the Perennial Plant Community of a Sonoran Desert Bajada, The Southwestern Naturalist, Vol. 29, No. 2 (May 30, 1984), pp. 211-222
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Key et al. (1984) studied this question.
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