Natural rubber, tea ,coconut oil and spices ;Part 1-5 ,Sri Lanka study 

 - Colombo  Marga Institute  1985 
 - 198p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural-economics
<br/><br/><label>Dewey Class. No.: </label>338.4  / NAT