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John C. Almendinger, James E. Almendinger, Paul H. Glaser, Topographic Fluctuations Across a Spring Fen and Raised Bog in the Lost River Peatland, Northern Minnesota, Journal of Ecology, Vol. 74, No. 2 (Jun., 1986), pp. 393-401
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Almendinger et al. (1986) studied this question.
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