Laporan PPM R014/2019: Extraction Of Rare Earth Elements (REE) From Monazite By Ion Exchange: A Preliminary Study For Recovery Of High Purity REE December 2019 Roshaida Bt. Arbain - Perak Pusat Penyelidikan Mineral, Jabatan Mineral Dan Geosains Malaysia 2019 - iv, 13 p ill, col, photo, table 29 cm