Thenabadu, Mervyn W.
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.
631.8 / THE
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.
631.8 / THE