Ground water in the western hemisphere /  
Department of Economic a nd Social Affairs. 
 - New York  :    United Nations,    1976. 
 - ix, 337 p.  :    ill.  ;    28 cm. 
 - Natural resources/water series ;    no. 4. .
<br/><br/>  "United Nations publication. Sales no. E.76.II.A.5." 
<br/><br/>Includes bibliography. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Groundwater -- America.