The Geological and Natural History Survey of Minnesota. The ninth annual report for the year 1880.

Winchell, N.H.2010-01-062010-01-061881https://hdl.handle.net/11299/56240Summary of the geological and natural history studies carried out in Minnesota during 1880.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The ninth annual report for the year 1880.Map