TY - GEN AU - Laskowski, J.S., ed. TI - Coal preparation : a multinational journal, vol. 8 ; No 3-4 ; 1990 SN - 2-88124-473-4 PY - 1990/// CY - New York PB - Gordon and Breach KW - COAL PREPARATION N1 - Contents : Magnetite dese medium : its rheology and the rheology on separation efficiency ER -