00274nam a2200097Ia 4500008004100000082001700041100004200058245002500100260004300125300000800168140113s9999    xx            000 0 und d  a632.937   L3  a"Van Den Bosch, R. & Mersanger, P.S."  aBiological Control    a1973bInternatinal textbook Co.cBucks  a180