00438nam a2200145Ia 450000500170000000800460001703700120006304000210007504100130009608400230010924500750013226000570020730000140026465000140027820250508153033.0008  250505s9999    xx            000 0 eng d  aTextual  aFEDL bengcFEDL  aeng2eng  a370.732, NATqFEDL 0aFiftieth yearbook : Of the national society for the study of education  aChicago, USA bThe University of Chicago Pressc1951  axix,369p.  aEducation