The Geological and Natural History Survey of Minnesota. The sixth annual report for the year 1877.

Winchell, N.H.2010-01-062010-01-061878https://hdl.handle.net/11299/56237Summary of the geological and natural history studies conducted in Minnesota during 1877.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The sixth annual report for the year 1877.Map