Water resources. 

 - New York :  United Nations (UN) ,  1993 
 - 4. :  ill. ;   28 cm.  
<br/><br/>Includes bibliographical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water resources
<br/><br/><label>Gov. Doc. Class. No.: </label>UN DTCD Wat