George Perkins Marsh, Rowland Hazard, Samuel B. Ruggles, Mario Bedoni, Thomas Robinson, Joseph Burrows, John Hyde, Robert Wallace, Léon Dru, Émile Levasseur, W. J. Ashley, Paul G. Strom, Wright Patman, American Farm Bureau Federation, R.I.) Washington County Agricultural Society (Washington County, United States. Federal Farm Board, Chamber of Commerce of the United States of America. Organization Service Bureau, Patrons of Industry of North America, National Farmers' Union (U.S.), International Institute of Agriculture, Uruguay. Ministerio de Industrias. Comision oficial de semillas, Société nationale d'agriculture de France · First published 1848
