000			00736nam a2200229 a 4500
005			20210219152824.0
008			991125n 000 0 eng u
035			_aUPN01000062360
100			_aHacker, R. G.
222			_aJOURNAL OF RESEARCH IN SCIENCE TEACHING
245			_aA study of the effects of an organization change from streamed to mixed-ability classes upon science classroom instruction
300			_a223-231
362			_a1993 30, no. 3
653	0		_aAGRUPAMIENTO POR HABILIDADES
653	0		_aEDUCACION CIENTIFICA
653	0		_aGRUPOS HETEROGENEOS
653	0		_aINSTRUCCION CIENTIFICA
653	0		_aTECNICAS DE OBSERVACION EN EL AULA
700			_aRowe, M. J.
904			_aAC _b000171
905			_aArticulo
999			_c61681 _d61681