Estimated world requirments of narcotics drugs and estimates of world production of opium in 1967 

 - Geneva  United Nations           1967 
 - 29p  cm. 
<br/><br/> First supplement 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>X9(F56):2.1N45.N67, K7,1 /UN