00271nam a2200097Ia 4500008004100000082001900041100003700060245003500097260003300132300000800165140113s9999    xx            000 0 und d  a628.54:63   L7  a"Hobson, P.N. & Robertson, A.M."  aWaste treatment in agriculture  a1977bA.S.PublisherscLondon  a257