Wellisch, Hans <br/><br/>
Subject retrieval in the seventies   : new directions proceedings of an International symposium held at the centre of adult education University of Maryland College Park May 14 to 15, 1971 

 - Westport   : Greenwood Publishing Company,  1972 
 - 180p.   ; 24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subject cataloguing<br/>Congresses<br/>Classification<br/>Book<br/>Information retrieval
<br/><br/><label>LC Class. No.: </label>Z695.S89