Gerard, Geoffrey. <br/><br/>
Hidro-electric engineering 

 - London :   Pitman,   1949. 
 - 181 p. : il. ; 22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CENTRALES HIDROELECTRICAS<br/>INGENIERIA HIDRAULICA
<br/><br/><label>Universal Decimal Class. No.: </label>621.22