Standard country or area codes for statistical use : 

 - New York :  United Nations (UN) ,  1999 
 - vii, 23p. ;  28 cm. 
<br/><br/> "ST/ESA/STAT/SER.M/49/Rev.2." 
<br/><br/>Includes bibliographical references and index. 
<br/><br/><label>ISBN: </label>9210611756 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Telephone--Area codes--Directories<br/>Zip codes--Directories
<br/><br/><label>Gov. Doc. Class. No.: </label>UN DIESA SP-M-49