Barkan, Joanne. <br/><br/>
What is velocity? 
Joanne Barkan 
 - ed. 
 - [S.l.]  Children's Press  2004 
 - 31 p. 
 - Rookie read-about science .
 - Rookie read-about science .
<br/><br/><label>ISBN: </label>0329419862 0516236164 (hc.) 051624664X (pbk.) 1415581290