00606nam a2200217 a 4500 20210219152933.0 991125n 000 0 u UPN01000067688 Slavin, Robert CONTEMPORARY EDUCATION Class size and student achievement : is smaller better? 6-12 62, No. 1, 1990 Enero 1992 CONDICIONES PARA LA ENSE\197ANZA DIMENSION DE LA CLASE RENDIMIENTO ACADEMICO TEACHING STUDENT RATIO AC 005499 Articulo 64141 64141