Thompson, Louis M. <br/><br/>
Soils and soil fertility 
Louis M. Thompson, Frederick R. Troeh 
 - 6th ed 
 - Ames, Iowa  Blackwell  2005 
 - viii, 489 p.  ill  25cm 
<br/><br/>includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780813809557 
<br/><br/><label>Dewey Class. No.: </label>631.4  /  T473