000			00684nam a2200229 a 4500
005			20210219153014.0
008			991125n 000 0 u
035			_aUPN01000072659
100			_aCooley, William W.
222			_aERS SPECTRUM
245			_aThe difficulty of the educational task : Implications for comparing student achievement in states, school districts and schools
300			_a27-31
362			_a11, No. 3, 1993
505			_aDiciembre 1993
653	0		_aEDUCACION COMPARADA
653	0		_aMARCADORES
653	0		_aPOLITICA EDUCATIVA
653	0		_aREFORMA FINANCIERA
653	0		_aRENDIMIENTO ACADEMICO
904			_aAC _b010470
905			_aArticulo
999			_c66044 _d66044