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Book Reviews : Institute for Scientific Co-operation (in conjunction with the Geological Survey of the Federal Republic of Germany and numerous members of German universities). Natural Resources and Development: A Biannual Collection of Recent German Con tributions Concerning the Exploration and Exploitation of Natural Resources. 2 vols. Tübingen: Institut für Wissenschaftliche Zusammenarbeit,I975. Pp. I70 (vol. I) and I34 (vol. 2). Price not indicated