Report to the Economic and Social Council on the twelfth session of the Commission, held in Geneva from 29 April to 31 May 1957. 

 - [Geneva :    United Nations Economic and Social Council, Commission on Narcotic Drugs,    1957]. 
 - 62 p. :    ill. ;    28 cm. 
<br/><br/>  Official records ;  
<br/><br/><label>Subjects--Topical Terms: </label><br/> Narcotics -- Periodicals.<br/> Opium trade -- Periodicals.<br/> Drug traffic -- Statistics -- Periodicals.<br/> Drug and Narcotic Control -- statistics.