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Farm tractors --- History.

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Farm tractors. --- Soil dynamics. --- Tillage.

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Farm mechanization --- Farm tractors --- United Nations Relief and Rehabilitation Administration.

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Farm tractors --- Testing --- Standards. --- 631 --- -Agricultural tractors --- Agricultural machinery --- Tractors --- Agriculture in general --- -Standards --- -Agriculture in general --- 631 Agriculture in general --- -631 Agriculture in general --- Agricultural tractors --- Testing&delete& --- Standards --- Farm tractors - Testing - Standards.

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The author describes the adoption of the mule as the major agricultural resource in the American South and its later displacement by the mechanical tractor. After describing the surprising slowness of southern farmers to realize the superiority of the mule over the horse for agricultural labor, Ellenberg strives to capture the symbiosis that emerged between animal and man to illuminate why and how the mule became a standard feature in Southern folk culture. Having been slow to adopt the mule, southern farmers were then reluctant to set it aside in favor of the

Mules --- Farm tractors --- Agricultural innovations --- History. --- Agricultural tractors --- Agriculture --- Innovations, Agricultural --- Technological change in agriculture --- Innovations --- Technological innovations --- Agricultural machinery --- Tractors --- Livestock --- Donkeys --- Horses --- Technology transfer