Seismic Tomography and Mantie Circulation. R. K. O'Nions and B. Parsons, Eds. Royal Society, London, 1989. viii, 152 pp., illus. {pound}37.50. Reprinted from Philosophical Transactions of the Royal Society A, vol. 328 (1989). From a meeting, London, U.K., April 1988.
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