Tropical Agriculture :  The Development of Production / 
Wrigler , Gordon  
 - 4th ed. 
 - London :  Longman ,  1981. 
 - xv,496 p,:  ill,; 
<br/><br/><label>ISBN: </label>0582460379 
<br/><br/><label>LC Class. No.: </label>S604.37  / .W74  1981