Browsing by Author "Koppen, Walter J."
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Item The Cost of Apple Production in Thirty-five Representative Orchards in Minnesota(1919-06) Koppen, Walter J.Item The cost of producing apples in Minnesota, 1916-1920(University of Minnesota. Agricultural Experiment Station, 1924-04) Brierley, WG; Koppen, Walter J.; Pond, George A.Item The Cost of Producing Apples in Minnesota, 1916-1920(Minnesota Agricultural Experiment Station, 1924) Brierley, WG; Pond, George A.; Koppen, Walter J.