Blackwood, Paul E. <br/><br/>
Push and pull :  the story of energy / 
Paul E. Blackwood ; illustrated by William D. Hayes 
 - Rev. ed. 
 - London :  John Murray,  1961 
 - vii, 182 p. :  ill. ;  21 cm. 
<br/><br/>Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Power (Mechanics)--Juvenile literature<br/>Machinery--Juvenile literature<br/>Energy
<br/><br/><label>Dewey Class. No.: </label>530  / B 568 ene