Humic substances II :  In search of structure / 
edited by Michael H. Hayes ... [et al.]. 
 - New York :  John Wiley & Sons,  1989 
 - 764 p. :  ill. ;  23 cm. 
<br/><br/> Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>047192279X  RM1136.90 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humic acid.<br/>Humus.