Hansen, K. THE MINERAL RESOURCES POTENTIAL OF THE EARTH: Proceedings of the 2. International Symposium in Hannover at the Federal Institute for Geosciences and Mineral Resources, April 18-20, 1979. Ed. F. Bender. Stuttgart 1979, V, 156 s., ill., 24 Cm. Pris Ikke Oplyst. E. Schweizerbart1 Sehe Verlagsbuchh. gt 1981, 81.