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| 245 | 0 | _aScience teaching: Guidelines for educational functionaries of states: Upper primary and secondary stages | |
| 245 | 0 | _cNCERT (New Delhi India) | |
| 260 |
_aNew Delhi, India _bNational Council of Educational Research and Training _c1990 |
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| 300 | _aiv,68p | ||
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_cHB _h507, NCE/O |
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_c1383310 _d1383310 |
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