00283nam a2200097Ia 4500008004100000082001700041100002500058245005100083260004300134300000800177140113s9999    xx            000 0 und d  a551.241   L3  a"Urrula, Marvin. B."  aContinental Drift : the evolution of a concept  a1974bSmithsonian Instt. PresscU.S.A.  a239