00440nam a2200145Ia 450000500170000000800460001703700290006304000210009204100130011308400210012610000190014724500550016626000600022130000130028120250508153437.0008  250505s9999    xx            000 0 eng d  aBooks to be hide in OPAC  aFEDL bengcFEDL  aeng2eng  a375, UNI/OqFEDL  aWright Grace S 0aCore curriculum development problems and practices  aWashington, USAbU.S. Government Printing Office c1957  avi,104p.