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 1902 Soil Culture Manual: Explains How the Rain Waters Are Stored and Conserved in the Soil; How Moisture Moves in the Soil by Capillary ... Conditions May Be Regulated by Cultivation
Campbell, Hardy Webster
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Campbell's Soil Culture Manual ...: 1902, 1905, 1907...
Campbell, Hardy Webster
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Campbell's 1907 Soil Culture Manual; A Complete Guide to Scientific Agriculture as Adapted to the Semi-Arid Regions
Campbell, Herbert
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Soil Culture Primer; a Plain and Practical Discussion of the Relation of Plants to the Soil and the Principles of Growth; the Laws Governing the ... the Soil and Its Evaporation From the Surface
Campbell, Hardy Webster 1850-
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