Helweg Otto J <br/><br/>
Water resources  Planning and management    
Helweg Otto J 
 - New York  John Wiley          1985 
 - xii,364p  cm. 
<br/><br/> Appendix P 311-350 
<br/><br/><label>ISBN: </label>0471047708 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engneering
<br/><br/><label>Dewey Class. No.: </label>X9(D2):8, M5