Phosphate rock and phosphatic fertilizers in the world :   role of international aid. 

 - Paris :   Organization for Economic Cooperation and Development,   1972. 
 - 130 p. :    ill., tables, annexes ;    24 cm. 
 - Technical papers   .
<br/><br/>  In English and French. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Phosphatic fertilizers.--------<br/>Phosphate rock.--------