OPEN University of Sri Lanka <br/><br/>
Course of study leading to the achelor of science level 3, ecology-zoology block 

 - Nugegoda  The Open University of Sri Lanka  1985 
 - 117 p. 
<br/><br/><label>ISBN: </label>139320 
<br/><br/><label>Dewey Class. No.: </label>591.5  / OPE