Brierley, WG, George Augustus Pond, and WJ Koppen. 1924. The cost of producing apples in minnesota, 1916-1920. University of Minnesota Agricultural Experiment Station Bulletin 209 : 1-44.
Brierley, WG; Pond, George A.; Koppen, Walter J..
The Cost of Producing Apples in Minnesota, 1916-1920.
Minnesota Agricultural Experiment Station.
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