00466nam a2200145Ia 450000500170000000800460001703700290006304000210009204100130011308400240012610000230015024500800017326000570025330000100031020250508161544.0008  250505s9999    xx            000 0 eng d  aBooks to be hide in OPAC  aFEDL bengcFEDL  aeng2eng  a370.58, NAT/OqFEDL  aHenry Nelson B Ed. 0aFiftieth yearbook of the national society for the study of education Part 2  aChicago, USA bThe University of Chicago Pressc1951  a369p.