OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree fo bachelor of science: botany PSU 1108-pr 

 - Nugegoda  The Open University of Sri Lanka  1988 
 - 85 p. 
<br/><br/><label>ISBN: </label>139191 
<br/><br/><label>Dewey Class. No.: </label>581  / OPE