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_aAcademia Nacional de Ciencias. Washington, D. C. _9383 |
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| 245 | _aImproving college biology teaching | ||
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_aWashington : _bNAS, _c1957 |
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| 300 | _a70 p. | ||
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_aNAS. Publication _v; 505 |
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_aBiología _xEstudio y enseñanza. _912782 |
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_aNAS. Publication _v; 505 _980258 |
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