Hudak, George JEssig, Espree2015-07-222017-04-142015-07-222017-04-1420152375-2793https://hdl.handle.net/11299/186992University of Minnesota Duluth 2015 UROP paperen-USGreenstoneNortheastern MinnesotaVermilion DistrictDuluth Journal of Undergraduate ResearchUniversity of Minnesota DuluthPetrographic Analysis of Felsic Tuffs within the Neoarchean Soudan Member of the Ely Greenstone Formation, NE MinnesotaArticle