Energy primer, solar water, wind and biofuels. 

 - Menlo, Calif. :  Portola Institute,  1974. 
 - 200 p. :  ill. ;  33 cm. 
<br/><br/>Includes bibliographical references and index. 
<br/><br/> Open access. 
<br/><br/><label>ISBN: </label>091477400X 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Power (Mechanics)<br/>Renewable energy sources.