Hudson, Norman. <br/><br/>
Soil conservation / 
Norman Hudson. 
 - 3rd rev. and updated ed. 
 - Ames, Iowa :  Iowa State University Press,  c1995. 
 - 391 p. : ill., maps. 
<br/><br/><label>ISBN: </label>0813823722 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil conservation.<br/>Soil erosion.