Hydrology and water resources for sustainable deve 

 - Paris  Unesco            1990 
 - 54p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electrical
<br/><br/><label>Dewey Class. No.: </label>X9(D85):77.1.N9, N0