Huisman, L., <br/><br/>
Slow sand filtration / 
by L. Huisman and W.E. Wood. 
 - Geneva:  World Health Organization,  1974. 
 - 122 p. :  ill. ;  24 cm. 
<br/><br/><label>ISBN: </label>9241540370 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification--Filtration