New sources of energy and economic development;    solar energy, win d energy, tidal energy, geothermic energy, and thermal energy of the se as. 

 - New York :    United Nations,    1957. 
 - vii, 150 p.    ill. ;    28 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Power resources.<br/> Mechanical engineering.