00295nam a2200109Ia 4500008004100000082001500041100002700056245004100083260002800124300001000152650002300162140113s9999    xx            000 0 und d  a632.937 J8  a" Sweetman, Harvey L."  aThe principles of biological control  b"WM. C Brown company, "  a560p.  aBiological control