Proceedings of the twentieth annual meeting and convention 
/ The National Microfilm Association 
 - Maryland:   The National Microfilm Association,   1971 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Information science
<br/><br/><label>Subjects--Index Terms: </label>Meeting 
<br/><br/><label>Universal Decimal Class. No.: </label>D 778.14:619(063)