Authors
K. R. Briffa, P. D. Jones, J. R. Pilcher, M. K. Hughes, Reconstructing Summer Temperatures in Northern Fennoscandinavia Back to A.D. 1700 Using Tree-Ring Data from Scots Pine, Arctic and Alpine Research, Vol. 20, No. 4 (Nov., 1988), pp. 385-394
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Briffa et al. (1988) studied this question.
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