00273nam a2200097Ia 4500008004100000082002300041100002100064245004200085260004100127300000700168140113s9999    xx            000 0 und d  a595.799-155.5   L7  a"Free, John. B."  aThe Social organization of honey bees  a1977bEdward Arnold(Pub)Ltd.cLondon  a66