Helweg, Otto J. <br/><br/>
Water resources planning and management 

 - New York  ; John Wiley & Sons  , 1985 
 - 364p. 
<br/><br/><label>ISBN: </label>  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water<br/>Water Resources
<br/><br/><label>Dewey Class. No.: </label>333.91  / HEL