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Hopkins, Cyril G. (Cyril George), 1866-1919
(3)
The Farm That Won't Wear Out [electronic resource] / Cyril G. Hopkins
Nitrogen Bacteria and Legumes : With special reference to red clover, cowpeas, soy beans, alfalfa, and sweet clover, on Illinois soils [electronic resource] / Cyril G. Hopkins
The Story of the Soil; from the Basis of Absolute Science and Real Life [electronic resource] / Cyril G. Hopkins
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