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H. W:son Ahlmann, Sigurdur Thorarinsson, The Vatnajökull Glacier: Preliminary Report on the Work of the Swedish-Icelandic Investigations 1936-1937, Geographical Review, Vol. 28, No. 3 (Jul., 1938), pp. 412-438
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Ahlmann et al. (1938) studied this question.
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