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_aLeón, L. A. _966224 |
| 245 | _aManagement of phosphurus in Andean countries of tropical Latin America | ||
| 500 | _aSobretiro de: Phosphurus in Agriculture No. 76:57-73, 1979. | ||
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_aFósforo _xEfecto en plantas. _942250 |
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_aFeuster, W. E. _940676 |
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