Campbell's 1907 Soil Culture Manual : a Complete Guide to Scientific Agriculture As Adapted to the Semi-Arid Regions : the Proper Fitting of the Soil for the Conservation And Control of Moisture And the Development of Soil Fertility ; How Moisture Moves I
Campbell's 1907 Soil Culture Manual : a Complete Guide to Scientific Agriculture As Adapted to the Semi-Arid Regions : the Proper Fitting of the Soil for the Conservation And Control of Moisture And the Development of Soil Fertility ; How Moisture Moves I
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