Subject retrieval in the seventies  new directions  proceedings of an International Symposium held at the Center of adult education University of Maryland College Park, May 14 to 15, 1971 
Edited by Hans (Hanan) Wellisch and Thomas D. Wilson 
 - Westport, Conn.  Greenwood Press  1972 
 - 180 p. ;  23 cm. 
 - Contributions in librarianship and information science .
<br/><br/>Includes bibliographies. 
<br/><br/><label>ISBN: </label>0837163226 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Subject cataloging--Congresses<br/>Classification--Books--Congresses<br/>Information retrieval--Congresses