02586oam 2200673 450 991070402750332120160219155904.0(CKB)5470000002437382(OCoLC)885009353(EXLCZ)99547000000243738220140731d1955 ua 0engurn||||||||||txtrdacontentcrdamediacrrdacarrierZinc-lead-copper resources and general geology of the upper Mississippi Valley district /by Allen V. Heyl [and three others][Washington, D.C.] :United States Department of the Interior, Geological Survey,1955.Washington :United States Government Printing Office.1 online resource (iii, 227-245 pages, 1 page of plate) illustrations, maps, chartsGeological Survey bulletin ;1015-GA contribution to economic geologyTitle from title screen (viewed July 21, 2014)."Prepared in cooperation with the Wisconsin Geological and Natural History Survey, the Illinois State Geological Survey, and the Iowa Geological Survey.Includes bibliographical references (pages 242-243) and index.GeologyMississippi River ValleyZinc mines and miningMississippi River ValleyLead mines and miningMississippi River ValleyCopper mines and miningMississippi River ValleyCopper mines and miningfastGeologyfastLead mines and miningfastZinc mines and miningfastMississippi River ValleyfastGeologyZinc mines and miningLead mines and miningCopper mines and miningCopper mines and mining.Geology.Lead mines and mining.Zinc mines and mining.Heyl Allen V(Allen Van),1918-2008,1387333Geological Survey (U.S.),Wisconsin Geological and Natural History Survey,Iowa Geological Survey,Illinois State Geological Survey,COPCOPOCLCOOCLCFTRAALGPOSTFGPOBOOK9910704027503321Zinc-lead-copper resources and general geology of the upper Mississippi Valley district3547356UNINA