Wolf, Ray. <br/><br/>
Organic farming  : yesterday's and tomorrow's agriculture 

 - Emmaus, Pa. :  Rodales,  1977 
 - 344 p.  : ilus. 
<br/><br/><label>LCCN: </label>52191 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultura orgánica.<br/>Sistemas de cultivo.
<br/><br/><label>Dewey Class. No.: </label>631.86  / W6