00319nam a2200121Ia 4500008004100000082001500041100001900056245004800075260003800123300001200161942000700173999001700180190709s9999    xx            000 0 und d  a370.78 B61  aBarnes, John B 0aEducational research for classroom teachers  aNew YorkbG P Putnam's Sonsc1960  axvi,229  cBK  c37122d37122