Guide to the universal decimal classification (UDC) B S 1000 C 025.45 
British Standard Institution 
 - London  W I British Standards House  1963 
 - 128p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Universal Decimal Classification<br/>Astronomy and Astrophysics Thesaurus 
<br/><br/><label>Universal Decimal Class. No.: </label>25.45  / BRI