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A. F. Mark, Ned Fetcher, G. R. Shaver, F. S. Chapin III, Estimated Ages of Mature Tussocks of Eriophorum vaginatum along a Latitudinal Gradient in Central Alaska, U.S.A., Arctic and Alpine Research, Vol. 17, No. 1 (Feb., 1985), pp. 1-5
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MARK et al. (1985) studied this question.
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