00468nam a2200145Ia 450000500170000000800460001703700290006304000210009204100130011308400240012610000240015024500790017426000570025330000120031020250508161732.0008  250505s9999    xx            000 0 eng d  aBooks to be hide in OPAC  aFEDL bengcFEDL  aeng2eng  a370.58, NAT/OqFEDL  aHenry Nelson B. Ed. 0aForty-seventh year book of the national society for the study of education  aChicago, USA bThe University of Chicago Pressc1948  ax,280p.