01889oam 2200553I 450 991070413140332120151230155433.0(CKB)5470000002438353(OCoLC)885119606(EXLCZ)99547000000243835320140802d1956 ua 0engurn||||||||||txtrdacontentcrdamediacrrdacarrierExploratory drilling for evidence of zinc and lead ore in Dubuque County, Iowa /by Arthur E. Flint and C. Ervin Brown[Washington, D.C.] :United States Department of the Interior, Geological Survey,1956.Washington :United States Government Printing Office.1 online resource (iii, 471-499 pages) illustrations, map, chartsGeological Survey bulletin ;1027-KA contribution to economic geologyTitle from title screen (viewed July 22, 2014)."Prepared in cooperation with the Iowa Geological Survey."Includes index.Lead oresIowaDubuque CountyZinc oresIowaDubuque CountyLead oresfastZinc oresfastIowaDubuque CountyfastLead oresZinc oresLead ores.Zinc ores.Flint Arthur E.1913-1391201Brown C. Ervin(Clarence Ervin),1925-Iowa Geological Survey,Geological Survey (U.S.),COPCOPOCLCOOCLCFGPOOCLCOGPOBOOK9910704131403321Exploratory drilling for evidence of zinc and lead ore in Dubuque County, Iowa3444768UNINA