Hardy Webster Campbell

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Progressive Agriculture, 1916: Tillage, Not Weather, Controls Yield [ 1916 ]
Campbell, Hardy Webster

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Campbell's Soil Culture Manual ...: 1902, 1905, 1907...
Campbell, Hardy Webster

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Campbell's 1902 Soil Culture Manual;
Campbell, Hardy Webster 1850-

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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 ... of Soil Fertility ; How Moisture Moves...
Campbell, Campbell

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