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T. E. Osterkamp, V. E. Romanovsky, Characteristics of Changing Permafrost Temperatures in the Alaskan Arctic, U.S.A., Arctic and Alpine Research, Vol. 28, No. 3, Arctic Soils and Permafrost: Special Issue in Memory of Kaye R. Everett (Aug., 1996), pp. 267-273
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Osterkamp et al. (1996) studied this question.
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