Ryan, William J. <br/><br/>
Water treatment and purification 
/ [by]William J.Ryan 
 - Jodhpur  Agrobios  2000 
 - ix, 270 p. 
<br/><br/> 	Includes appendeixes and index 
<br/><br/><label>Dewey Class. No.: </label>628.168  / RYA