Current bibliographical information. 

 - New York  U.N.           1993 
 - vi; 199p.  cm. 
 -  V.23, No.6 .
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Dewey Class. No.: </label>a14,11N45,N93, N3.23-6/UN