Carman, Elbert S. The New Potato Culture As Developed by the Trench System: By the Judicious Use of Chemical Fertilizers, and by the Experiments Carried On at the Rural Grounds During the Past Fifteen Years
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The New Potato Culture As Developed by the Trench System: By the Judicious Use of Chemical Fertilizers, and by the Experiments Carried On at the Rural Grounds During the Past Fifteen Years