I. G. Simmons, J. B. Innes, Late Quaternary Vegetational History of the North York Moors. IX. Numerical Analysis and Pollen Concentration Analysis of Flandrian II Peat Profiles from North Gill, Glaisdale Moor, Journal of Biogeography, Vol. 15, No. 2 (Mar., 1988), pp. 273-297
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Simmons et al. (1988) studied this question.
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