Niels Nielsen (1893–1981) was a Danish geographer and professor of geology at Copenhagen University, particularly noted for his research on the volcanoes and glaciers of IcelandHelgi Björnsson, The Glaciers of Iceland: A Historical, Cultural and Scientific Overview, trans. by Julian Meldon D'Arcy (no place: Atlantis Press, 2017), pp. 172, 180 . and the geomorphology of Jutland's West Coast and the Wadden Sea, in particular the Skallingen peninsula.
Works Nielsen's works include the following books: Contributions to the physiography of Iceland: with particular reference to the highlands west of Vatnajökull (København: Levin & Munksgaard, 1933) Vatnajökull: Kampen mellem ild og is (København: Hagerup, 1937)
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