Browsing by Author "Schoper, Robert P."
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Item Fertility Status of Minnesota Soils As Shown By Soil Tests(Minnesota Agricultural Experiment Station, 1979) Grava, John; Fenster, William E.; Schoper, Robert P.Item Guide to computer programmed soil test recommendations in Minnesota (revised 1978)(University of Minnesota. Agricultural Extension Service, 1978) Fenster, William E.; Overdahl, Curtis J.; Simkins, Charles A.; Grava, John; Schoper, Robert P.