Vas, Gratian <br/><br/>
Hydro energy / 
Gratian Vas. 
 - New Delhi :  Streling Pub.,  2006. 
 - 31 p.:  25 cm. 
<br/><br/><br/>English 
<br/><br/><label>ISBN: </label>1-84557-250-5 
<br/><br/><label>LC Class. No.: </label>333.914 V44h