Geothermal energy :   review of research and development /  
edite d by H. Christopher H. Armstead. 
 - Paris :   United Nations Educational, Scientific and Cultural Organ isation,   1973. 
 - 186 p. ;    27 cm. 
 - Earth sciences ;   12. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geothermal engineering.--------<br/>Geothermal resources.--------