Global workshop on appeopriate water and waste water treatment technology for developing countries 
published by WHO International reference centre for community water supply 
 - netherlands  by WHO International reference centre for community water supply  1977 
 - 48p.iii 4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>water treatment
<br/><br/><label>Dewey Class. No.: </label>628.16  / WHO