Allison, F. E., <br/><br/>
Soil organic matter and its role in crop production 
by F.E. Allison. 
 - Amsterdam  Elsevier Science  1973. 
 - 637pages :   26cm. 
 - Developments in soil science  3 .
<br/><br/>Includes bibliographical references and indexes 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humus