1993. Hobbs, Howard C. and Meyer, Gary N. Quaternary geology map showing interpretations of Quaternary (Pleistocene [glacial] and Holocene [post-glacial]) surficial geology (distribution an... Minnesota Geological Survey.
1999. Berg, James A., Harris, Kenneth L., and Knaeble, Alan R. Quaternary geology map showing interpretations of Quaternary (Pleistocene [glacial] and Holocene [post-glacial]) surficial geology (distribution an... Minnesota Geological Survey.
1999. Berg, James A., Harris, Kenneth L., and Knaeble, Alan R. Quaternary (glacial and stream sediment) stratigraphy of the upper Minnesota River basin, Minnesota, scale 1:200,000. Minnesota Geological Survey.
2002. Minnesota. Division of Waters. Quaternary (glacial and stream sediment) hydrogeology (ground water information) map of the Otter Tail area, west-central Minnesota, scale 1:200,000. Minnesota Department of Natural Resources, Division of Waters.