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_aHeller, R. _953453 |
| 245 | _aNew trends in biology teaching | ||
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_aParis : _bUNESCO, _c1967-71 |
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_a3 v. _b: ilus. |
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_aThe teaching of basic sciences _v; Biology |
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_aBiología _xEstudio y enseñanza. _912782 |
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_aThe teaching of basic sciences _v; Biology _9112716 |
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