Stevenson, F. J. <br/><br/>
Humus chemistry :  genesis, composition, reactions / 
F. J. Stevenson. 
 - New York :  Wiley,  1982. 
 - xiii, 443 p. :  ill. ;  24 cm. 
<br/><br/>Includes index. 
<br/><br/><label>ISBN: </label>0471092991 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humus