Proceedings 

 - New York  United Nations USA         1973 
 - vii, 213p.  cm. 
 - United  Nations Water resources series .
<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):27p4,N72, L3/UN