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Egan Т. The Worst Hard Time: The Untold Story of Those Who Survived the Great American Dust. Boul. Y. Mifflin. 2006; Olmmsted A.L., Rhode P.W. Reshaping the Landscape: The Impact and Diffusion of the Tractor in American Agricalture, 1910–1960. The Jornal of Economic History. Vol. 61, №3, Sept. 2001.

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