National power grids and extra-high-voltage system 

 - New York  United Nations USA         1975 
 - v, 80p.  cm. 
 - United Nations, Energy Resources Development series, 14. .
<br/><br/> Sales No >: E.75.11.F.13 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical
<br/><br/><label>Dewey Class. No.: </label>X 9(D66).4.N7, L5