Petr Cerny & Peter Moller 
Lanthanides, Tantalum and Niobium [PDF ebook] 
Mineralogy, Geochemistry, Characteristics of Primary Ore Deposits, Prospecting, Processing and Applications Proceedings of a workshop in Berlin, November 1986

Rare Earth Elements (REE) as well as tantalum and niobium are of tremendous importance because of their specific high-technology applications. The contributions gathered in this volume give an up-to-date survey on the mineralogy, primary ore deposits, prospecting, processing and applications of REE, Ta, and Nd, making this volume a useful handbook for practitioners and students. Finally, the comprehensive coverage of the fundamental aspects, especially as regards REE as tracers of geological phenomena, will prove extremely helpful.