Haswell, Margaret <br/><br/>
Energy for subsistence / 
Margaret Haswell 
 - London  Macmillan Press Ltd.  1981 
 - xiii, 100p  ill.   20 cm.  
<br/><br/>Includes bibliographic references and index  
<br/><br/><label>ISBN: </label>0333287347 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Energy
<br/><br/><label>Dewey Class. No.: </label>333.7  / HAS