Primary sources of energy. 

 - Geneva :  International Telecommunication Union,  1970. 
 - 1 v. (loose-leaf) :  ill. 
<br/><br/> At head of title: The International Telegraph and Teleophone Consulative Committee. (C.C.I.T.T.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric power production.