Sub-Regional Workshop on Educational and Information Material Concerning the Problems Associated with the Use of Drugs, 1980 :  Freetown, Sierra Leone. Presentation of the workshop and documents / 
Edmée Montando. 
 - Paris :  UNESCO,  1980. 
 - pág. irregular. ;  il. 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>37.178.8 (6) =20 "1980" PRE.