DR. LAURA E. POWERS/ DR. ROBERT MCSORLEY <br/><br/>
ECOLOGICAL PRINCIPLES OF AGRICULTURE 

 - AFRICA  DELMAR  1999 
 - XI,433PG,ILLUS  PBK 
<br/><br/><label>ISBN: </label>0766806537 
<br/><br/><label>LC Class. No.: </label>S 589 .P6 1999