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David E. Buchele, Jerry M. Baskin, Carol C. Baskin, Ecology of the Endangered Species Solidago shortii. I. Geography, Populations, and Physical Habitat, Bulletin of the Torrey Botanical Club, Vol. 116, No. 4 (Oct. - Dec., 1989), pp. 344-355
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Buchele et al. (1989) studied this question.
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