Universal Decimal Classification 

 - London:   British Standards Institution,   1943 
 - 103p.  
<br/><br/> Part 1. (Classes 50  General works on pure science 51 mathematics 52 astronomy, geodesy 53 physics) Vol. 2 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Library science
<br/><br/><label>Subjects--Index Terms: </label>Classification Nature 
<br/><br/><label>Universal Decimal Class. No.: </label>D 025.45  / H3.1