Harris, Kenneth L.Quaternary geology map showing interpretations of Quaternary (Pleistocene [glacial] and Holocene [post-glacial]) surficial geology (distribution and type of materials at the land surface) and type of material, of the Crookston quadrangle, scale 1:100,000.PDFengMinnesota Geological SurveyPublicQuaternary geology of the Crookston 30' x 60' quadrangle, northwest Minnesota Minnesota, M-173, Plate 2MapsMinnesota2006University of Minnesota