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_aQH 541 _b2 V38 |
| 100 | 1 | _aVásquez Torre, Guadalupe Ana María | |
| 245 | 1 | 0 | _aEcología y formación ambiental |
| 260 |
_aMéxico : _bMcGraw-Hill, _c1992 |
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| 300 |
_a303 p. : _bil., maps. ; _c23 cm. |
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_aNaturaleza - _xEstudio |
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_aEcología - _xEstudios y enseñanza |
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