Davies, Delwyn,  -. <br/><br/>
Fresh Water :  The precious resouce / 

 - 
 - New york :  The American Museum of Natural History,  1969. 
 - p155. :ill :  - ;   cm.15. 
 - .
<br/><br/> -. 
<br/><br/>Includes bib refs. 
<br/><br/> -. 
<br/><br/><label>ISBN: </label> - 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Supply.<br/>Water---.<br/>----.