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| 363.738409682 (1) |
| Acid mine drainage (1) |
| Acid mine drainage -- South Africa -- Vaal River (1) |
| Mines and mineral resources -- Environmental aspects -- South Africa -- Vaal River (1) |
| Mining (1) |
| Socio-economic impacts (1) |
| South Africa (1) |
| Sustainable development (1) |
| Vaal River (South Arica) (1) |
| Water management (1) |
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