Hobbs, Howard C.Quaternary geology map showing interpretations of Quaternary (Pleistocene [glacial] and Holocene [post-glacial]) surficial geology (distribution and type of materials at the land surface), of the Two Harbors quadrangle, scale 1:24,000.PDFengMinnesota Geological SurveyPublicSurficial geology of the Two Harbors quadrangle, Lake County, Minnesota, M-138MapsMinnesota2003University of Minnesota