Surface formations and agricultural conditions of northeastern Minnesota - Leverett, Frank, 1859-1943.; Sardeson, Frederick William, 1866-; Purssell, Ulysses G.; University of Minnesota; Geological Survey (U.S.) (Minneapolis, The University of Minnesota, 1917)
At head of title: The University of Minnesota.
"In cooperation with the United States Geological survey."
Keywords: Geology -- Minnesota; Agriculture -- Minnesota; Soils -- Minnesota; Minnesota -- Climate