00346nam a2200133Ia 4500008004100000082001500041100002400056245004100080250000800121260004500129300001400174942000700188999001700195190709s9999    xx            000 0 und d  a370.78 T98  aTravers, Robert M W 0aIntroduction to educational research  a2nd  aNew YorkbMacmillan & Cillier Macmc1964  axxiii,581  cBK  c38125d38125