Soil erosion and crop productivity / editors, R.F. Follett and B.A. Stewart. Follett, R. F. (Ronald F.), 1939- Stewart, B. A. (Bobby Alton), 1932- Soil erosion. Soil conservation. Crops and soils. Crop yields. Soil erosion United States. Soil conservation United States. Crops and soils United States. Crop yields United States. S623 .S5737 1985 631.45 19 S683 Includes bibliographies and index. Madison, Wis., U.S.A. : American Society of Agronomy, 1985. 1985. 1985 Text xxiv, 533 p. : eng United States. United States. United States. United States.