Water.   Unit 5-6,  Water quality, analysis and management / 
 Water quality, analysis and management.  Unit 5-6. 
Prepared by the Course Team. 
 - Milton Keynes :  The Open University,1992. 
 - 83 p. :  ill. ;  30 cm. 
 - Environmental control and public health. .
<br/><br/> Technology : a second level course. 
<br/><br/>Includes bibliographical references.3 
<br/><br/><label>ISBN: </label>0749261722 (pbk.)