Berg, James A.Harris, Kenneth L.Knaeble, Alan R.Quaternary (glacial and stream sediment) stratigraphy of the upper Minnesota River basin, Minnesota, scale 1:200,000.PDFengMinnesota Geological SurveyPublicQuaternary geology-Otter Tail area, west-central Minnesota, RHA-5, Part A, Plate 2MapsMinnesota1999University of Minnesota