1. The Empire Concentrator-Iron Ore's First Two-Stage Autogenous Grinding Flowsheet;Coyle,1965
2. Flotation of Iron Ore;Erck;Quart. Colo. School Mines,1961
3. Anionic Flotation of Silica from Western Mesabi and Menominee Range Iron Ores;Frommer;BuMines Rept. of Inv.,1964
4. USBM Tests on Selective Iron Ore Flotation Point Way to Greater Recoveries;Frommer;Mining Engr.,1964