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A.I.M.E. Trans abstract annual mining symposium Anonymous biography Biwabik Blast F Bsns Center for continuation concentration Cong continuation study Cuyuna Iron Range Cuyuna Range diagrs Duluth Econ Explosives Eng flow sheet Geol iron mining industry iron ore industry iron ore mines iron ore properties iron ore reserves iron ore shipments Iron ore shipped iron-ore Jour July 29 June 26 L. S. iron Lake iron Lake Superior district Lake Superior iron Lake Superior mines Lake Superior region Louis county M.G.S. Bull magnetite manganiferous iron Mesabi Iron Range Mesabi Range Mineral Mines Experiment Station Minn Minnesota iron mines Minnesota iron ranges Minnesota mining Mountain Iron N. H. Winchell Oliver Iron Mining p.l. Nov p.l+ Proc Range of Minnesota reprint Safety shaft shipments by companies Skill sota Steel PI stripping Superior iron mines taconite tons U.S. Bur Univ Vermilion Range washing plant