World Health Organization <br/><br/>
Operation and maintenance of urban water supply and sanitation systems: a guide for managers.  Operation and maintenance of urban water supply and sanitation systems: a guide for managers. 

 - Geneva  WHO  1994 
 - ix, 102p., 24cm. 
<br/><br/><label>ISBN: </label>92-4154471-6. 
<br/><br/><label>Dewey Class. No.: </label>628.1,  / O51Q