The Geological and Natural History Survey of Minnesota. The twenty-first annual report for the year 1892.

Winchell, N.H.2010-01-072010-01-071893https://hdl.handle.net/11299/56265Summary of the geological and natural history studies carried out in Minnesota during 1892.engeologynatural historyMinnesotalandformsThe Geological and Natural History Survey of Minnesota. The twenty-first annual report for the year 1892.Map