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Tectonophysics, 212 (1992) 163-172 163 Elsevier Science Publishers B. bebelove fl V , Amsterdam Crustal structure associated with Gondwana graben across the Narmada-Son lineament in India: an inference from aeromagnetics D Atchuta Rao, H V Ram Babu and G D J Sivakumar Sinha National Geophysical Research Institute, Hyderabad 500007, India (Received February 8, 1990; revised version accepted July 31, 1991