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Hansen., K. 1956. W. H. Emmons, G. A.Thiel, C. R. Stauffer and I. S. Allison: Geology. Principles and processes. McGraw-Hill Book Comp., New York, Toronto, London. Fourth Edition. 1955. 638 sider. 519 fig., 23x15 cm. Geografisk Tidsskrift. 55, (jan. 1956).