Introduction Unit1- 2:  environmental control and public health 
 Environmental control and public health. 
prepared by the Course Team. 
 - T237 Units 1 and 2. 
 - London   The Open Univesty,  1992 
 - 63 p. :  ill.;  27 cm. 
 - Technology:a second level course. .
<br/><br/> Includes bibliogrphical references. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Polluction--environmental control.<br/>Biology.