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Hansen, K. 1981. A GEOLOGICAL MAP OF ETHIOPIA AND SOMALIA (1973) 1:2.000.000 and comment with a map of major landforms. By Giovanni Merla . et al. Firenze 1979, VIII, 95 s., ill. & 2 kort i lomme, 34 cm, $ 60.-. Pergamon Press Ltd., Oxford. Geografisk Tidsskrift. 81, (jan. 1981).