Harpstead, Milo I., <br/><br/>
Soil science simplified / 
Milo I. Harpstead, Thomas J. Sauer, William F. Bennett ; illustrated by Mary C. Bratz. 
 - 4th ed. 
 - Ames :  Iowa State University Press,  2001. 
 - vii, 225 p. :  ill., maps ; 
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0813829429 (alk. paper) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Soil science.
<br/><br/><label>LC Class. No.: </label>S591  / .H28 2001 
<br/><br/><label>Dewey Class. No.: </label>