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 / 
Ed. Kürsten M. 
 - Stuttgart :  E.Schweizerbart'sche,  1990. 
 - VII,158 s.,il. ;  24cm. 
<br/><br/><label>ISBN: </label>351065143X 
<br/><br/><label>Universal Decimal Class. No.: </label>661(061.3)  666.3(061.3)