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

 - Geneva :  World Health Organization,  2003. 
 - 20 p.  ill. ;  23 cm. 
<br/><br/><label>ISBN: </label>92 4 159083 1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sanitation--history<br/>Sanitation--trends<br/>Water supply<br/>Environmental health