Rare earths : extraction preparation and applications : proceedings of a symposium on Rare Earths, Extraction, Preparation and Applications sponsored by the TMS Reactive Metals Committee, held at the TMS Annual Meeting in Las Vegas, Nevada, February 27-March 2, 1989 - Bautista, Renato G.; Wong, M. M. (Morton Min); TMS Reactive Metals Committee; TMS. Meeting (TMS, 1988)