Hayes, Denis,  1944- <br/><br/>
Energy  the case for conservation 
Denis Hayes 
 - [Washington  Worldwatch Institute]  1976 
 - 77 p.  graphs  22 cm. 
 - Worldwatch paper  4 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Energy conservation--United States
<br/><br/><label>Dewey Class. No.: </label>333.7