Energy, forces and resources / 

 - London  Cambridge University Press  1984 
 - 64p.  ill. 
<br/><br/><label>ISBN: </label>0521260000 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedias
<br/><br/><label>Dewey Class. No.: </label>531.68  / C144