පරිසර අධ්‍යයනය  

 -  Ministry of Education / University of Peradeniya, 
 - 55p.;  ill.;  28cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Environmental Science
<br/><br/><label>Index Terms--Curriculum Objective: </label><br/>Postal Teacher Training Course (open uni)