The Geological and Natural History Survey of Minnesota. The seventh annual report for the year 1878.

Winchell, N.H.2010-01-062010-01-061879https://hdl.handle.net/11299/56238Summary of the geological and natural history studies carried out in Minnesota during 1878.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The seventh annual report for the year 1878.Map