... Erosion and related land use conditions in Winona county, Minnesota Brown, Mark Herbert 1900- creator Nygard, Iver J. (Iver John) 1903- text dcu Washington [U.S. Govt. Print. Off. 1941] 1941 monographic eng
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1 p. l., 33 p. incl. illus., tables, diagrs. 77 maps (76 fold. in pocket) 27 cm. by Mark H. Brown and Iver J. Nygard ... Issued by U. S. Dept. of Agriculture, Soil Conservation Service. Soil conservation Minnesota Winona County S623 .U44 no. 17 631.45 U. S. Soil Conservation Service. Erosion survey no. 17 agr41000288 U. S. Dept. of Agr. Library 800722 20260227110959.0 agr41000288