M. J. C. Walker, J. J. Lowe, Postglacial Environmental History of Rannoch Moor, Scotland III. Early-and Mid-Flandrian Pollen Stratigraphic Data from Sites on Western Rannoch Moor and Near Fort William, Journal of Biogeography, Vol. 8, No. 6 (Nov., 1981), pp. 475-491
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Walker et al. (1981) studied this question.
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