The Geological and Natural History Survey of Minnesota. The fifteenth annual report for the year 1886.

Winchell, N.H.2010-01-062010-01-061887http://purl.umn.edu/56247Summary of the geological and natural history studies carried out in Minnesota during 1886.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The fifteenth annual report for the year 1886.Map