00479nam a2200157Ia 450000500170000000800460001703700290006304000200009204100130011208400090012524500610013424500560019526000460025130000090029754600150030620250508160144.0008  250505s9999    xx            000 0 eng d  aBooks to be hide in OPAC  aFEDLbengcFEDL  aeng2eng  qFEDL 0aConstant and variable errors of educational measurements 0cBureau of Educational Research College of Education  aUrbana bThe University of Illinoisc1923  a30p.  aWeeded out