Browsing by Author "Duncan, E. R."
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Item Fertilizer Grades and Ratios for Minnesota(University of Minnesota. Agricultural Extension Service, 1947-02) Rost, C. O.; Burson, Paul M.; Duncan, E. R.Item Fertilizer Grades and Ratios for Minnesota (Revised 1950)(University of Minnesota. Agricultural Extension Service, 1950-01) Rost, C. O.; Burson, Paul M.; Duncan, E. R.; Jones, H. E.Item Soil Fertility and conservation: a Minnesota program(University of Minnesota. College of Agriculture. Extension Division, 1947-03) Burson, Paul M.; Rost, C. O.; Duncan, E. R.