Books by Hardy Webster Campbell
Campbells 1902 Soil Culture Manual;
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Campbell's 1902 Soil Culture Manual;
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Campbells 1907 Soil Culture Manual: a Complete Guide to Scientific Agriculture as Adapted to the Semi-arid Regions: the Proper Fitting of the Soil fo
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Campbell's Soil Culture Manual ...: 1902, 1905, 1907
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Campbell's Soil Culture Manual ...: 1902, 1905, 1907
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Campbells 1907 Soil Culture Manual; a Complete Guide to Scientific Agriculture as Adapted to the Semi-arid Regions
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Progressive Agriculture, 1916: Tillage, Not Weather, Controls Yield
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