00286nam a2200097Ia 4500008004100000082001700041100003600058245006600094260002000160300000800180140113s9999    xx            000 0 und d  a633.001   L2  a"John, Wishart & Senders, H.G."  aPrinciples  and practice of field experimentation 2nd edition  a1972bCABcU.K.  a133