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| 005 | 20210219152824.0 | ||
| 008 | 991125n 000 0 eng u | ||
| 035 | _aUPN01000062402 | ||
| 100 | _aSlavin, Robert E. | ||
| 222 | _aELEMENTARY SCHOOL JOURNAL | ||
| 245 | _aAbility grouping in the middle grades : achievement effects and alternatives | ||
| 300 | _a535-552 | ||
| 362 | _a1993 93, no. 5 | ||
| 653 | 0 | _aAGRUPAMIENTO | |
| 653 | 0 | _aAGRUPAMIENTO POR HABILIDADES | |
| 653 | 0 | _aESCUELAS MEDIAS | |
| 653 | 0 | _aGRUPOS HETEROGENEOS | |
| 653 | 0 | _aRENDIMIENTO ACADEMICO | |
| 904 |
_aAC _b000213 |
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| 905 | _aArticulo | ||
| 999 |
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