00311nam a2200109Ia 4500008004100000082001700041100002000058245004200078260004800120300001000168650002300178140113s9999    xx            000 0 und d  a632.937.1 L4  a" Debach, Paul"  aBiological control by natural enemies  b"London : Cambridge university press, 1974"  a323p.  aBiological control