Wellisch, Hans. <br/><br/>
Subject retrieval in the seventies  : New directions 
/ by Hans Wellisch and Thomas D. Wilson 
 - USA:   Greenwood Publishing Company,   1972. 
 - 180p. 
 - Contribution in librarianship and information science .
<br/><br/><label>ISBN: </label>0837163226 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Classification<br/>Indexing<br/>Library science<br/>Subject retrieval
<br/><br/><label>Dewey Class. No.: </label>025.33  / WEL/S