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P ART one concerns basics of the erosion process in terms of particle dynamics, threshold condi-tions, particle flux, and the protective role of nonerodible elements. Part two is a procedure for evaluating wind-erosion effects on soil loss and, subsequently, on crop yields. In the procedure, a wind-erosion equation is used to predict potential annual loss, which is converted to crop-yield reduction per centimeter of erosion for wheat, grain sorghum, and corn. Where applied in the Oklahoma Panhandle (in 2 1/4 counties), the procedure resulted in estimated annual yield reductions of wheat and grain sorghum equivalent to a total crop failure on about 4,530 ha (1 1,200 acre, or 17.5 sections) of the 163 300 ha (403,500 acre) of cultivated sandy sur-face soils in the selected area