00375nam a2200133Ia 4500008004100000082001700041100002100058245004700079260004600126300000800172650001400180650002000194653002700214170901s1951    xx            000 0 und d  a370.15bE58E  aEllis, Robert S. 0aEducational PsychologybA Problem Approach  aNew JerseybD. Van Nostrand Companyc1951  a546  aEducation  aSocial sciences  aEducational psychology