Harcourt Science   Unit F, Exploring Energy and Forces /  
Authors Marjorie Slavick Frank and others 
 - Orlando :  Harcourt School Publishers,   w.d. 
 - w.p. :  ill.   28 cm. 
<br/><br/><label>ISBN: </label>0-15-315691-0 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Physical sciences--Study and teaching (Elementary) <br/>Science
<br/><br/><label>Subjects--Index Terms: </label>Force and energy