Soil organic matter in sustainable agriculture / 
edited by Fred Magdoff, Ray R. Weil 
 - Boca Raton :  CRC Press,  c2004 
 - 398 p. :  ill. ;  27 cm. 
 - Advances in agroecology .
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>0849312949 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humus<br/>Soil ecology<br/>Sustainable agriculture