Obourn, Ellsworth S  <br/><br/>
World exploring of science  

 - Princeton:   D. Van Nostrand Company, Inc.,   1963 
 - xii, 414p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science 
<br/><br/><label>Subjects--Index Terms: </label>Changing world  
<br/><br/><label>Universal Decimal Class. No.: </label>5/6:37   / K3