02201oam 2200505 450 991070715010332120160502145541.0(CKB)5470000002461997(OCoLC)891382554(EXLCZ)99547000000246199720140926d1966 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierAeromagnetic and tectonic analysis of the Upper Mississippi Valley zinc-lead district a magnetic study indicating major geologic structures in the basement rock which controlled in part the locations of overlying ore deposits /by Allen V. Heyl and Elizabeth R. King ; prepared in cooperation with the Wisconsin Geological and Natural History Survey[Washington, D.C.] :United States Department of the Interior, Geological Survey,1966.Washington :United States Government Printing Office.1 online resource (16 pages, 1 page of plates) illustrations, color mapGeological Survey bulletin ;1242-AContributions to economic geologyTitle from title screen (viewed September 15, 2014).Includes bibliographical references (pages 15-16).Aeromagnetic and tectonic analysis of the Upper Mississippi Valley zinc-lead district Geology, StructuralAnalysisAeromagnetic prospectingAnalysisGeologyMississippi River ValleyOre depositsMississippi River ValleyGeology, StructuralAnalysis.Aeromagnetic prospectingAnalysis.GeologyOre depositsHeyl Allen V(Allen Van),1918-2008,1387333King Elizabeth R.Geological Survey (U.S.),Wisconsin Geological and Natural History Survey,COPCOPOCLCOGPOBOOK9910707150103321Aeromagnetic and tectonic analysis of the Upper Mississippi Valley zinc-lead district3457905UNINA