Barkan, Joanne <br/><br/>
What is density? / 
Joanne Barkan. 
 - New York:  Scholastic,  2006. 
 - 31 pages:  col. ill.;  18 cm. 
<br/><br/><label>ISBN: </label>978-0-516-24660 
<br/><br/><label>Subjects--Topical Terms: </label>--Science - Literature.
<br/><br/><label>Dewey Class. No.: </label>Sc B24wh 2006