Universal decimal classification. Interonational 

 - 4th 
 - London  British standards Institutions       1971 
 - 40p.  cm. 
 - FID pub; 179 .
<br/><br/> Contents UDC 66/66.09 Chemical and related industries. Chemical technology 
<br/><br/><label>Standard No.: </label>6,521 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>LIBRARY SCIENCE
<br/><br/><label>Dewey Class. No.: </label>2;51M96, qL0;L1