00295nam a2200109Ia 4500008004100000082001500041100002600056245004400082250000800126260003800134300001300172190709s9999    xx            000 0 und d  a370.15 L64  aLindgren, Henery Clay 0aEducational psychology in the classroom  a2nd  aNew YorkbJohn Wiley & Sonsc1962  axvii,574