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| 100 | 1 | _aCésarman, Fernando | |
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_aYo, naturaleza / _cFernando Césarman |
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_aMéxico : _bCONACYT, _c1981 |
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| 300 | _a110 p. | ||
| 650 | 4 | _aECOLOGÍA | |
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_aHOMBRE _xINFLUENCIA EN LA NATURALEZA |
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