The Geological and Natural History Survey of Minnesota. The fourth annual report for the year 1875.

Winchell, N.H.Harrington, M.W.2010-01-062010-01-061875https://hdl.handle.net/11299/56235Summary of the geological and natural history studies carried out in Minnesota during 1875.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The fourth annual report for the year 1875.Map