00283nam a2200109Ia 4500008004100000082001400041100002300055245002500078260005100103300000900154650001000163140113s9999    xx            000 0 und d  a632.51 L7  a" Hill, Thomas A."  aThe biology of weeds  b"New Delhi : Oxford & IBH publishing Co, 1977"  a64p.  aWeeds