On the move :  unit 15. 

 - New York :  McGraw-hill,  c1995. 
 - viii, 48 pages :  illustrations ;  27 cm. 
<br/><br/>Study guide. 
<br/><br/><label>ISBN: </label>0028245172  9780028245171 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science -- Study and teaching (Elementary) <br/>Science -- Study and teaching (Secondary).
<br/><br/><label>Dewey Class. No.: </label>500 MOV