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  1. By: Schupp, Marcia. - Gausman, H. W. - Cardenas, Ruben. - Rio Grande Soil and Water Research Center (U.S.) - Earth Resources Survey Program (U.S.)
    Publication info: Weslaco, Tex. :Rio Grande Soil and Water Research Center, Soil and Water Conservation Research Division, Agricultural Research Service, U.S. Dept. of Agriculture,[1969]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library