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close this section of the libraryIbach, D. B. (Donald Bryan), 1900- 4n(2)
View the documentIbach, D. B. (Donald Bryan), 1900- 4n; Fertilizer use in the United States : its economic position and outlook / . Washington : Economic Research Service, U.S. Dept. of Agriculture, 1966.
View the documentIbach, D. B. (Donald Bryan), 1900- 4n; Crop yield response to fertilizer in the United States / . Washington, D.C. : U.S. Dept. of Agriculture, Economic Research Service and Statistical Reporting Service, 1968.