TY - BOOK AU - Kürsten M. TI - Raw Materials for New Technologies.Proceedings of the Fifth International Symposium,held in Hannover,Fed. Rep.of Germany,at the Federal Institute for Geoscien- ces and Natural Resources October 19-21,1988 SN - 351065143X PY - 1990/// CY - Stuttgart PB - E.Schweizerbart'sche ER -