01233nam 2200349I 450 991070692900332120180423154438.0(CKB)5470000002460190(OCoLC)1032007878(EXLCZ)99547000000246019020180423d1951 ua 0engur|||||||||||txtrdacontentcrdamediacrrdacarrierMagnetic base stations in Lake Superior iron districts /by Gordon D. Bath[Washington, D.C.] :U.S. Department of the Interior, Bureau of Mines,1951.1 online resource (58 unnumbered pages) illustrations, mapsReport of investigations ;4804At head of title: United States Department of the Interior, Bureau of Mines.Includes bibliographical references.ProspectingGeophysical methodsProspectingGeophysical methods.Bath G. D.1386774United States.Bureau of Mines,GPOGPOBOOK9910706929003321Magnetic base stations in Lake Superior iron districts3493907UNINA