MacCarthy, Patrick <br/><br/>
Humic substances in soil and crop sciences  : selected readings 

 - Madison, Wisconsin :  American Society of Agronomy,  1990 
 - 281 p 
<br/><br/><label>LCCN: </label>10127 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acido humico.<br/>Humus.<br/>Suelos y cultivos.<br/>Suelos--Fertilidad.
<br/><br/><label>Dewey Class. No.: </label>631.417  / M3