Mann, H. T & Williamson, D <br/><br/>
Water sanitation and treatment  a handbook of simple methods for rural areas in developing countries 

 - Intermediate Technology, U.K.  1986 
 - 96 
<br/><br/><label>ISBN: </label>0 903031 23 
<br/><br/><label>Dewey Class. No.: </label>628.7 Man/Wil