Looking back  looking ahead : five decades of challenges and achivements in environmental sanitation and health 

 - Geneva  WHO  2003 
 - 20 p.  Illustration 
<br/><br/><label>ISBN: </label>9241590831 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ENVIRONMENTAL HEALTH<br/>Sanitation - history<br/>Sanitation trends<br/>Water supply
<br/><br/><label>Dewey Class. No.: </label>363.7  / L55