Soil erosion and crop productivity 
editors, R.F. Follett and B.A. Stewart 
 - Madison, Wis., U.S.A  American Society of Agronomy  1985 
 - xxiv, 533 p.  ill  24 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil erosion<br/>Soil conservation<br/>Crops and soils<br/>Crop yields<br/>Soil erosion--United States<br/>Soil conservation--United States<br/>Crops and soils--United States<br/>Crop yields--United States
<br/><br/><label>Dewey Class. No.: </label>631.4  / 5