Young People's Science Encyclopedia Volume 20 

 - Chicago:  Childrens Press,  1963. 
 - ix,171p.;  25cm 
 - Youth People's Science Encyclopedia   Volume 20 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science Encyclopedia
<br/><br/><label>Dewey Class. No.: </label>503  / YOU