Grolier, Eric de. <br/><br/>
A study of general categories applicable to classification and codin g in documentation. 

 - Paris :    UNESCO ,    1962 
 - 248 p.;    22 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Documentation.<br/> Classification of sciences.