Thenabadu, Mervyn W. <br/><br/>
Science education series no 5 : use of feritilizers and manures in Sri Lanka 
Mervyn W. Thenabadu,  
 - [S.I]  National science council of Sri Lanka 
 - 42 p. 
<br/><br/><label>Dewey Class. No.: </label>631.8  / THE