World guide to technical information and documentation services 

 - 2nd ed. rev. and enl 
 - Paris  The Unesco Press  1975 
 - 515 p. ; 21 cm. 
<br/><br/><label>ISBN: </label>9230012289 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Technology--Information services--Directories