Introduction.   Unit 3,  Environmental chemistry / 
Prepared by the Course Team. 
 - Milton Keynes :  The Open University,  1995. 
 - 79 p.  :  ill. ;  30 cm. 
 - Environmental control and public health. .
<br/><br/> Technology : a second level course. 
<br/><br/><label>ISBN: </label>0749272996  (pbk.)