Walker, Richard. <br/><br/>
The heart in action / 
by Richard Walker. 
 - London :  Watts,  2004. 
 - 32 p. :  col. ill ;  28 cm. 
 - Body Science .
 - Body Science .
<br/><br/> Includes index. 
<br/><br/><label>ISBN: </label>0749651350 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Blood--Circulation--Juvenile literature.<br/>Heart--Juvenile literature.
<br/><br/><label>Dewey Class. No.: </label>612.1