00267nam a2200097Ia 4500008004100000082001900041100001900060245004200079260004000121300000800161140113s9999    xx            000 0 und d  a632.937.3   L4  a"Paul, Debach"  aBiological Control by natural enemies  a1974bCambridge Univ. PresscLondon  a323