The Geological and Natural History Survey of Minnesota. The First annual report for the year 1872.

Winchell, N.H.2010-01-062010-01-061872https://hdl.handle.net/11299/56232Summary of geological and natural history investigations in Minnesota in 1872 and earlier.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The First annual report for the year 1872.Map