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_aBeyers, L. _912128 |
| 245 | _aInvloed van Koperbemesting op die koperinhoud van sekere gewase | ||
| 500 | _aSobretiro de S. Afr. Tydskr. Landboumet 9 : 907-910, 1966 | ||
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_aCobre en plantas. _924193 |
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_aFertilizantes _xEfecto en plantas. |
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