Halacy, D. S.  1919- <br/><br/>
Earth, water, wind, and sun :  our energy alternatives / 
D. S. Halacy 
 - New York :  Harper & Row,  1977 
 - 186 p. :  ill. ;  22 cm. 
<br/><br/>Bibliography : p. 179-180 
<br/><br/><label>ISBN: </label>006011777X 
<br/><br/><label>LCCN: </label>76-5128 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Power resources