00289nam a2200097Ia 4500008004100000082001500041100003200056245006800088260002800156300000700184140113s9999    xx            000 0 und d  a632.9   L9  a"Welch, S.M. & Croft, B.A."  aThe design of biological monitering systems for pest management  a1979bPUDOCcWageningen  a77